40218831 has 12 divisors (see below), whose sum is σ = 58284720. Its totient is φ = 26724480.

The previous prime is 40218823. The next prime is 40218859. The reversal of 40218831 is 13881204.

It is not a de Polignac number, because 40218831 - 2³ = 40218823 is a prime.

It is a super-2 number, since 2×40218831² = 3235108734013122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40218795 and 40218804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40218931) 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, 4386 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (4857060).

Almost surely, 2^40218831 is an apocalyptic number.

40218831 is a deficient number, since it is larger than the sum of its proper divisors (18065889).

40218831 is a wasteful number, since it uses less digits than its factorization.

40218831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14686 (or 14683 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 40218831 is about 6341.8318331536. The cubic root of 40218831 is about 342.6177150563.

The spelling of 40218831 in words is "forty million, two hundred eighteen thousand, eight hundred thirty-one".