40631 has 4 divisors (see below), whose sum is σ = 41664. Its totient is φ = 39600.

The previous prime is 40627. The next prime is 40637. The reversal of 40631 is 13604.

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

It is a cyclic number.

It is not a de Polignac number, because 40631 - 2² = 40627 is a prime.

It is a super-2 number, since 2×40631² = 3301756322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40637) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 455 + ... + 536.

It is an arithmetic number, because the mean of its divisors is an integer number (10416).

2⁴⁰⁶³¹ is an apocalyptic number.

40631 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

40631 is a deficient number, since it is larger than the sum of its proper divisors (1033).

40631 is an equidigital number, since it uses as much as digits as its factorization.

40631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1032.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 40631 is about 201.5713273261. The cubic root of 40631 is about 34.3784139860.

The spelling of 40631 in words is "forty thousand, six hundred thirty-one".