23039640 has 160 divisors (see below), whose sum is σ = 83548080. Its totient is φ = 5660928.

The previous prime is 23039587. The next prime is 23039651. The reversal of 23039640 is 4693032.

23039640 is a `hidden beast` number, since 230 + 396 + 40 = 666.

It is a super-2 number, since 2×23039640² = 1061650022659200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 41847 + ... + 42393.

Almost surely, 2^23039640 is an apocalyptic number.

23039640 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 23039640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41774040).

23039640 is an abundant number, since it is smaller than the sum of its proper divisors (60508440).

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

23039640 is a wasteful number, since it uses less digits than its factorization.

23039640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 23039640 is about 4799.9624998535. The cubic root of 23039640 is about 284.5499823126.

The spelling of 23039640 in words is "twenty-three million, thirty-nine thousand, six hundred forty".