40685904 has 120 divisors (see below), whose sum is σ = 131436032. Its totient is φ = 11508480.

The previous prime is 40685881. The next prime is 40685921. The reversal of 40685904 is 40958604.

40685904 is a `hidden beast` number, since 4 + 0 + 68 + 590 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182337 + ... + 182559.

Almost surely, 2^40685904 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 40685904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65718016).

40685904 is an abundant number, since it is smaller than the sum of its proper divisors (90750128).

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

40685904 is a wasteful number, since it uses less digits than its factorization.

40685904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 40685904 is about 6378.5503055161. The cubic root of 40685904 is about 343.9389201091.

The spelling of 40685904 in words is "forty million, six hundred eighty-five thousand, nine hundred four".