23215138 has 8 divisors (see below), whose sum is σ = 36023580. Its totient is φ = 11207280.

The previous prime is 23215117. The next prime is 23215139. The reversal of 23215138 is 83151232.

It can be written as a sum of positive squares in 2 ways, for example, as 21594609 + 1620529 = 4647^2 + 1273^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (23215139) 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, 200073 + ... + 200188.

Almost surely, 2^23215138 is an apocalyptic number.

23215138 is a deficient number, since it is larger than the sum of its proper divisors (12808442).

23215138 is a wasteful number, since it uses less digits than its factorization.

23215138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400292.

The product of its digits is 1440, while the sum is 25.

The square root of 23215138 is about 4818.2090033538. The cubic root of 23215138 is about 285.2706488181.

The spelling of 23215138 in words is "twenty-three million, two hundred fifteen thousand, one hundred thirty-eight".