23398731 has 6 divisors (see below), whose sum is σ = 33798180. Its totient is φ = 15599148.

The previous prime is 23398729. The next prime is 23398757. The reversal of 23398731 is 13789332.

It is a happy number.

It is not a de Polignac number, because 23398731 - 2¹ = 23398729 is a prime.

It is a super-2 number, since 2×23398731² = 1095001224820722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23398031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1299921 + ... + 1299938.

It is an arithmetic number, because the mean of its divisors is an integer number (5633030).

Almost surely, 2^23398731 is an apocalyptic number.

23398731 is a deficient number, since it is larger than the sum of its proper divisors (10399449).

23398731 is a wasteful number, since it uses less digits than its factorization.

23398731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599865 (or 2599862 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 23398731 is about 4837.2234804689. The cubic root of 23398731 is about 286.0206800376.

The spelling of 23398731 in words is "twenty-three million, three hundred ninety-eight thousand, seven hundred thirty-one".