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807981 = 3269327
BaseRepresentation
bin11000101010000101101
31112001100020
43011100231
5201323411
625152353
76603426
oct3052055
91461306
10807981
11502059
1232b6b9
132239c5
1417064d
1510e606
hexc542d

807981 has 4 divisors (see below), whose sum is σ = 1077312. Its totient is φ = 538652.

The previous prime is 807973. The next prime is 807997. The reversal of 807981 is 189708.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 807981 - 23 = 807973 is a prime.

It is a super-2 number, since 2×8079812 = 1305666592722, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (807901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134661 + ... + 134666.

It is an arithmetic number, because the mean of its divisors is an integer number (269328).

2807981 is an apocalyptic number.

807981 is the 569-th centered pentagonal number.

It is an amenable number.

807981 is a deficient number, since it is larger than the sum of its proper divisors (269331).

807981 is a wasteful number, since it uses less digits than its factorization.

807981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269330.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 807981 is about 898.8776334964. The cubic root of 807981 is about 93.1394600911.

The spelling of 807981 in words is "eight hundred seven thousand, nine hundred eighty-one".

Divisors: 1 3 269327 807981