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999981056 = 21530517
BaseRepresentation
bin111011100110101…
…000000000000000
32120200122022010102
4323212220000000
54021443343211
6243121021532
733531461444
oct7346500000
92520568112
10999981056
11473510628
1223aa848a8
1312c231689
1496b44824
155cbcaa3b
hex3b9a8000

999981056 has 32 divisors (see below), whose sum is σ = 1999997130. Its totient is φ = 499974144.

The previous prime is 999981049. The next prime is 999981061. The reversal of 999981056 is 650189999.

It can be written as a sum of positive squares in only one way, i.e., 999571456 + 409600 = 31616^2 + 640^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×9999810562 = 1999924224717750272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999980992 and 999981010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17510 + ... + 48026.

Almost surely, 2999981056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999981056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999998565).

999981056 is an abundant number, since it is smaller than the sum of its proper divisors (1000016074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999981056 is an frugal number, since it uses more digits than its factorization.

999981056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30547 (or 30519 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 56.

The square root of 999981056 is about 31622.4770693252. The cubic root of 999981056 is about 999.9936852935.

The spelling of 999981056 in words is "nine hundred ninety-nine million, nine hundred eighty-one thousand, fifty-six".

Divisors: 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 8192 16384 30517 32768 61034 122068 244136 488272 976544 1953088 3906176 7812352 15624704 31249408 62498816 124997632 249995264 499990528 999981056