23172998387 has 32 divisors (see below), whose sum is σ = 31119704064. Its totient is φ = 16714605600.

The previous prime is 23172998383. The next prime is 23172998447. The reversal of 23172998387 is 78389927132.

It is not a de Polignac number, because 23172998387 - 2² = 23172998383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23172998383) 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, 156143 + ... + 265944.

It is an arithmetic number, because the mean of its divisors is an integer number (972490752).

Almost surely, 2^23172998387 is an apocalyptic number.

23172998387 is a deficient number, since it is larger than the sum of its proper divisors (7946705677).

23172998387 is a wasteful number, since it uses less digits than its factorization.

23172998387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422159.

The product of its digits is 9144576, while the sum is 59.

The spelling of 23172998387 in words is "twenty-three billion, one hundred seventy-two million, nine hundred ninety-eight thousand, three hundred eighty-seven".