23400440 has 48 divisors (see below), whose sum is σ = 61252200. Its totient is φ = 8022336.

The previous prime is 23400427. The next prime is 23400451. The reversal of 23400440 is 4400432.

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, 4010 + ... + 7929.

Almost surely, 2^23400440 is an apocalyptic number.

23400440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23400440 is an abundant number, since it is smaller than the sum of its proper divisors (37851760).

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

23400440 is a wasteful number, since it uses less digits than its factorization.

23400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11964 (or 11953 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 23400440 is about 4837.4001281680. The cubic root of 23400440 is about 286.0276433417.

Adding to 23400440 its reverse (4400432), we get a palindrome (27800872).

The spelling of 23400440 in words is "twenty-three million, four hundred thousand, four hundred forty".