23407640 has 64 divisors (see below), whose sum is σ = 57736800. Its totient is φ = 8501248.

The previous prime is 23407633. The next prime is 23407667. The reversal of 23407640 is 4670432.

It is a happy number.

It is a super-2 number, since 2×23407640² = 1095835220739200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19127 + ... + 20313.

Almost surely, 2^23407640 is an apocalyptic number.

23407640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23407640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28868400).

23407640 is an abundant number, since it is smaller than the sum of its proper divisors (34329160).

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

23407640 is a wasteful number, since it uses less digits than its factorization.

23407640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1244 (or 1240 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 23407640 is about 4838.1442723424. The cubic root of 23407640 is about 286.0569759504.

The spelling of 23407640 in words is "twenty-three million, four hundred seven thousand, six hundred forty".