40642531 has 8 divisors (see below), whose sum is σ = 41879264. Its totient is φ = 39424320.

The previous prime is 40642517. The next prime is 40642549. The reversal of 40642531 is 13524604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40642531 - 2⁵ = 40642499 is a prime.

It is a super-2 number, since 2×40642531² = 3303630652171922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40642496 and 40642505.

It is not an unprimeable number, because it can be changed into a prime (40642571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111 + ... + 9016.

It is an arithmetic number, because the mean of its divisors is an integer number (5234908).

Almost surely, 2^40642531 is an apocalyptic number.

40642531 is a deficient number, since it is larger than the sum of its proper divisors (1236733).

40642531 is an equidigital number, since it uses as much as digits as its factorization.

40642531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9261.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 40642531 is about 6375.1494884434. The cubic root of 40642531 is about 343.8166585441.

The spelling of 40642531 in words is "forty million, six hundred forty-two thousand, five hundred thirty-one".