40685831 has 2 divisors, whose sum is σ = 40685832. Its totient is φ = 40685830.

The previous prime is 40685809. The next prime is 40685839. The reversal of 40685831 is 13858604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40685831 - 2⁶ = 40685767 is a prime.

It is a super-2 number, since 2×40685831² = 3310673688321122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40685791 and 40685800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40685839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342915 + 20342916.

It is an arithmetic number, because the mean of its divisors is an integer number (20342916).

Almost surely, 2^40685831 is an apocalyptic number.

40685831 is a deficient number, since it is larger than the sum of its proper divisors (1).

40685831 is an equidigital number, since it uses as much as digits as its factorization.

40685831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 40685831 is about 6378.5445832102. The cubic root of 40685831 is about 343.9387144068.

The spelling of 40685831 in words is "forty million, six hundred eighty-five thousand, eight hundred thirty-one".