23309988 has 24 divisors (see below), whose sum is σ = 58574208. Its totient is φ = 7172256.

The previous prime is 23309981. The next prime is 23309989. The reversal of 23309988 is 88990332.

It is a super-3 number, since 3×23309988³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (23309981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74556 + ... + 74867.

It is an arithmetic number, because the mean of its divisors is an integer number (2440592).

Almost surely, 2^23309988 is an apocalyptic number.

It is an amenable number.

23309988 is an abundant number, since it is smaller than the sum of its proper divisors (35264220).

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

23309988 is a wasteful number, since it uses less digits than its factorization.

23309988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149443 (or 149441 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 23309988 is about 4828.0418390896. The cubic root of 23309988 is about 285.6586306357.

The spelling of 23309988 in words is "twenty-three million, three hundred nine thousand, nine hundred eighty-eight".