23841640 has 32 divisors (see below), whose sum is σ = 53788680. Its totient is φ = 9510912.

The previous prime is 23841611. The next prime is 23841641. The reversal of 23841640 is 4614832.

It can be written as a sum of positive squares in 4 ways, for example, as 23020804 + 820836 = 4798^2 + 906^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23841599 and 23841608.

It is not an unprimeable number, because it can be changed into a prime (23841641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22564 + ... + 23596.

Almost surely, 2^23841640 is an apocalyptic number.

23841640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23841640 is an abundant number, since it is smaller than the sum of its proper divisors (29947040).

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

23841640 is a wasteful number, since it uses less digits than its factorization.

23841640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621 (or 1617 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 23841640 is about 4882.7901859490. The cubic root of 23841640 is about 287.8140839702.

The spelling of 23841640 in words is "twenty-three million, eight hundred forty-one thousand, six hundred forty".