15997863 has 20 divisors (see below), whose sum is σ = 24895288. Its totient is φ = 9137520.

The previous prime is 15997859. The next prime is 15997871. The reversal of 15997863 is 36879951.

It is not a de Polignac number, because 15997863 - 2² = 15997859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15997853) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6093 + ... + 8313.

Almost surely, 2^15997863 is an apocalyptic number.

15997863 is a deficient number, since it is larger than the sum of its proper divisors (8897425).

15997863 is an frugal number, since it uses more digits than its factorization.

15997863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2252 (or 2231 counting only the distinct ones).

The product of its digits is 408240, while the sum is 48.

The square root of 15997863 is about 3999.7328660799. The cubic root of 15997863 is about 251.9729909325.

The spelling of 15997863 in words is "fifteen million, nine hundred ninety-seven thousand, eight hundred sixty-three".