23400531 has 24 divisors (see below), whose sum is σ = 42142464. Its totient is φ = 12155760.

The previous prime is 23400529. The next prime is 23400617. The reversal of 23400531 is 13500432.

It is not a de Polignac number, because 23400531 - 2¹ = 23400529 is a prime.

It is a super-2 number, since 2×23400531² = 1095169702163922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23400331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16191 + ... + 17576.

It is an arithmetic number, because the mean of its divisors is an integer number (1755936).

Almost surely, 2^23400531 is an apocalyptic number.

23400531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

23400531 is a deficient number, since it is larger than the sum of its proper divisors (18741933).

23400531 is a wasteful number, since it uses less digits than its factorization.

23400531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33791 (or 33788 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 23400531 is about 4837.4095340378. The cubic root of 23400531 is about 286.0280141108.

Adding to 23400531 its reverse (13500432), we get a palindrome (36900963).

Subtracting from 23400531 its reverse (13500432), we obtain a palindrome (9900099).

The spelling of 23400531 in words is "twenty-three million, four hundred thousand, five hundred thirty-one".