40687857 has 12 divisors (see below), whose sum is σ = 67167360. Its totient is φ = 23250168.

The previous prime is 40687771. The next prime is 40687859. The reversal of 40687857 is 75878604.

It is not a de Polignac number, because 40687857 - 2⁸ = 40687601 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (40687859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322857 + ... + 322982.

It is an arithmetic number, because the mean of its divisors is an integer number (5597280).

Almost surely, 2^40687857 is an apocalyptic number.

It is an amenable number.

40687857 is a deficient number, since it is larger than the sum of its proper divisors (26479503).

40687857 is a wasteful number, since it uses less digits than its factorization.

40687857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645852 (or 645849 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 40687857 is about 6378.7033948915. The cubic root of 40687857 is about 343.9444232596.

The spelling of 40687857 in words is "forty million, six hundred eighty-seven thousand, eight hundred fifty-seven".