40312631 has 4 divisors (see below), whose sum is σ = 40554192. Its totient is φ = 40071072.

The previous prime is 40312603. The next prime is 40312681. The reversal of 40312631 is 13621304.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40312631 is a prime.

It is a super-2 number, since 2×40312631² = 3250216436284322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40312681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120530 + ... + 120863.

It is an arithmetic number, because the mean of its divisors is an integer number (10138548).

Almost surely, 2^40312631 is an apocalyptic number.

40312631 is a deficient number, since it is larger than the sum of its proper divisors (241561).

40312631 is a wasteful number, since it uses less digits than its factorization.

40312631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241560.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40312631 is about 6349.2228658317. Note that the first 3 decimals coincide. The cubic root of 40312631 is about 342.8838639310.

Adding to 40312631 its reverse (13621304), we get a palindrome (53933935).

The spelling of 40312631 in words is "forty million, three hundred twelve thousand, six hundred thirty-one".