23453840 has 20 divisors (see below), whose sum is σ = 54530364. Its totient is φ = 9381504.

The previous prime is 23453839. The next prime is 23453849. The reversal of 23453840 is 4835432.

It can be written as a sum of positive squares in 2 ways, for example, as 4129024 + 19324816 = 2032^2 + 4396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×23453840² = 1100165221491200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23453849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146507 + ... + 146666.

Almost surely, 2^23453840 is an apocalyptic number.

23453840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23453840 is an abundant number, since it is smaller than the sum of its proper divisors (31076524).

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

23453840 is a wasteful number, since it uses less digits than its factorization.

23453840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293186 (or 293180 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 23453840 is about 4842.9164766698. The cubic root of 23453840 is about 286.2450505427.

The spelling of 23453840 in words is "twenty-three million, four hundred fifty-three thousand, eight hundred forty".