23643945 has 36 divisors (see below), whose sum is σ = 44392140. Its totient is φ = 11636352.

The previous prime is 23643929. The next prime is 23643973. The reversal of 23643945 is 54934632.

23643945 is a `hidden beast` number, since 2 + 3 + 643 + 9 + 4 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 8363664 + 15280281 = 2892^2 + 3909^2 .

It is not a de Polignac number, because 23643945 - 2⁴ = 23643929 is a prime.

It is a super-2 number, since 2×23643945² = 1118072270326050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6051 + ... + 9159.

It is an arithmetic number, because the mean of its divisors is an integer number (1233115).

Almost surely, 2^23643945 is an apocalyptic number.

It is an amenable number.

23643945 is a deficient number, since it is larger than the sum of its proper divisors (20748195).

23643945 is a wasteful number, since it uses less digits than its factorization.

23643945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146 (or 3130 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 23643945 is about 4862.5039845742. The cubic root of 23643945 is about 287.0163563543.

The spelling of 23643945 in words is "twenty-three million, six hundred forty-three thousand, nine hundred forty-five".