40212531 has 80 divisors (see below), whose sum is σ = 70567200. Its totient is φ = 22643712.

The previous prime is 40212521. The next prime is 40212547. The reversal of 40212531 is 13521204.

It is not a de Polignac number, because 40212531 - 2¹¹ = 40210483 is a prime.

It is a super-2 number, since 2×40212531² = 3234095298851922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (40212511) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 758701 + ... + 758753.

It is an arithmetic number, because the mean of its divisors is an integer number (882090).

Almost surely, 2^40212531 is an apocalyptic number.

40212531 is a deficient number, since it is larger than the sum of its proper divisors (30354669).

40212531 is a wasteful number, since it uses less digits than its factorization.

40212531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 40212531 is about 6341.3351117884. The cubic root of 40212531 is about 342.5998245619.

Adding to 40212531 its reverse (13521204), we get a palindrome (53733735).

The spelling of 40212531 in words is "forty million, two hundred twelve thousand, five hundred thirty-one".