40904985 has 32 divisors (see below), whose sum is σ = 71860608. Its totient is φ = 19704320.

The previous prime is 40904977. The next prime is 40904989. The reversal of 40904985 is 58940904.

It is not a de Polignac number, because 40904985 - 2³ = 40904977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40904989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27829 + ... + 29261.

It is an arithmetic number, because the mean of its divisors is an integer number (2245644).

Almost surely, 2^40904985 is an apocalyptic number.

It is an amenable number.

40904985 is a deficient number, since it is larger than the sum of its proper divisors (30955623).

40904985 is a wasteful number, since it uses less digits than its factorization.

40904985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 40904985 is about 6395.7005089357. The cubic root of 40904985 is about 344.5551502360. Note that the first 3 decimals are identical.

The spelling of 40904985 in words is "forty million, nine hundred four thousand, nine hundred eighty-five".