23400540 has 36 divisors (see below), whose sum is σ = 70982184. Its totient is φ = 6240096.

The previous prime is 23400529. The next prime is 23400617. The reversal of 23400540 is 4500432.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64822 + ... + 65181.

Almost surely, 2^23400540 is an apocalyptic number.

23400540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23400540 is an abundant number, since it is smaller than the sum of its proper divisors (47581644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23400540 is a wasteful number, since it uses less digits than its factorization.

23400540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130018 (or 130013 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 23400540 is about 4837.4104642877. The cubic root of 23400540 is about 286.0280507802.

Adding to 23400540 its reverse (4500432), we get a palindrome (27900972).

The spelling of 23400540 in words is "twenty-three million, four hundred thousand, five hundred forty".