84905931 has 16 divisors (see below), whose sum is σ = 127484928. Its totient is φ = 49797600.

The previous prime is 84905917. The next prime is 84905959. The reversal of 84905931 is 13950948.

It is not a de Polignac number, because 84905931 - 2⁶ = 84905867 is a prime.

It is a super-2 number, since 2×84905931² = 14418034237953522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84905931.

It is not an unprimeable number, because it can be changed into a prime (84905971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40476 + ... + 42521.

It is an arithmetic number, because the mean of its divisors is an integer number (7967808).

Almost surely, 2^84905931 is an apocalyptic number.

84905931 is a deficient number, since it is larger than the sum of its proper divisors (42578997).

84905931 is a wasteful number, since it uses less digits than its factorization.

84905931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83042.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 84905931 is about 9214.4414372223. The cubic root of 84905931 is about 439.5207091599.

The spelling of 84905931 in words is "eighty-four million, nine hundred five thousand, nine hundred thirty-one".