23257940 has 12 divisors (see below), whose sum is σ = 48841716. Its totient is φ = 9303168.

The previous prime is 23257933. The next prime is 23257951. The reversal of 23257940 is 4975232.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2446096 + 20811844 = 1564^2 + 4562^2 .

It is a junction number, because it is equal to n+sod(n) for n = 23257897 and 23257906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581429 + ... + 581468.

It is an arithmetic number, because the mean of its divisors is an integer number (4070143).

Almost surely, 2^23257940 is an apocalyptic number.

23257940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23257940 is an abundant number, since it is smaller than the sum of its proper divisors (25583776).

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

23257940 is a wasteful number, since it uses less digits than its factorization.

23257940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162906 (or 1162904 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 23257940 is about 4822.6486498604. The cubic root of 23257940 is about 285.4458600386.

The spelling of 23257940 in words is "twenty-three million, two hundred fifty-seven thousand, nine hundred forty".