23215988 has 12 divisors (see below), whose sum is σ = 40901700. Its totient is φ = 11529792.

The previous prime is 23215987. The next prime is 23216003. The reversal of 23215988 is 88951232.

It can be written as a sum of positive squares in 2 ways, for example, as 14227984 + 8988004 = 3772^2 + 2998^2 .

It is a super-2 number, since 2×23215988² = 1077964197632288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23215987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18881 + ... + 20072.

It is an arithmetic number, because the mean of its divisors is an integer number (3408475).

Almost surely, 2^23215988 is an apocalyptic number.

It is an amenable number.

23215988 is a deficient number, since it is larger than the sum of its proper divisors (17685712).

23215988 is a wasteful number, since it uses less digits than its factorization.

23215988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39106 (or 39104 counting only the distinct ones).

The product of its digits is 34560, while the sum is 38.

The square root of 23215988 is about 4818.2972095959. The cubic root of 23215988 is about 285.2741304126.

The spelling of 23215988 in words is "twenty-three million, two hundred fifteen thousand, nine hundred eighty-eight".