15997023 has 24 divisors (see below), whose sum is σ = 27262976. Its totient is φ = 8845200.

The previous prime is 15997021. The next prime is 15997039. The reversal of 15997023 is 32079951.

It is not a de Polignac number, because 15997023 - 2¹ = 15997021 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997021) 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 23 ways as a sum of consecutive naturals, for example, 2143 + ... + 6048.

Almost surely, 2^15997023 is an apocalyptic number.

15997023 is a deficient number, since it is larger than the sum of its proper divisors (11265953).

15997023 is a wasteful number, since it uses less digits than its factorization.

15997023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8235 (or 8232 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 15997023 is about 3999.6278576888. The cubic root of 15997023 is about 251.9685807389.

The spelling of 15997023 in words is "fifteen million, nine hundred ninety-seven thousand, twenty-three".