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19998976 = 2878121
BaseRepresentation
bin100110001001…
…0100100000000
31101122001102211
41030102210000
520104431401
61552351504
7331663024
oct114224400
941561384
1019998976
111031a588
126845594
1341b2b1a
142928384
151b50951
hex1312900

19998976 has 18 divisors (see below), whose sum is σ = 39920342. Its totient is φ = 9999360.

The previous prime is 19998949. The next prime is 19998977. The reversal of 19998976 is 67989991.

It can be written as a sum of positive squares in only one way, i.e., 17438976 + 2560000 = 4176^2 + 1600^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19998976.

It is not an unprimeable number, because it can be changed into a prime (19998977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38805 + ... + 39316.

Almost surely, 219998976 is an apocalyptic number.

19998976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19998976 is a deficient number, since it is larger than the sum of its proper divisors (19921366).

19998976 is an frugal number, since it uses more digits than its factorization.

19998976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78137 (or 78123 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 58.

The square root of 19998976 is about 4472.0214668537. The cubic root of 19998976 is about 271.4371289744.

The spelling of 19998976 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred seventy-six".

Divisors: 1 2 4 8 16 32 64 128 256 78121 156242 312484 624968 1249936 2499872 4999744 9999488 19998976