23009987 has 32 divisors (see below), whose sum is σ = 31309824. Its totient is φ = 16329600.

The previous prime is 23009983. The next prime is 23009999. The reversal of 23009987 is 78990032.

It is not a de Polignac number, because 23009987 - 2² = 23009983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23009987.

It is not an unprimeable number, because it can be changed into a prime (23009983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127037 + ... + 127217.

It is an arithmetic number, because the mean of its divisors is an integer number (978432).

Almost surely, 2^23009987 is an apocalyptic number.

23009987 is a deficient number, since it is larger than the sum of its proper divisors (8299837).

23009987 is a wasteful number, since it uses less digits than its factorization.

23009987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 23009987 is about 4796.8726270352. The cubic root of 23009987 is about 284.4278539122.

The spelling of 23009987 in words is "twenty-three million, nine thousand, nine hundred eighty-seven".