15870897 has 40 divisors (see below), whose sum is σ = 28296576. Its totient is φ = 8667648.

The previous prime is 15870839. The next prime is 15870937. The reversal of 15870897 is 79807851.

It is not a de Polignac number, because 15870897 - 2⁷ = 15870769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15870097) 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 39 ways as a sum of consecutive naturals, for example, 12433 + ... + 13649.

Almost surely, 2^15870897 is an apocalyptic number.

It is an amenable number.

15870897 is a deficient number, since it is larger than the sum of its proper divisors (12425679).

15870897 is a wasteful number, since it uses less digits than its factorization.

15870897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1250 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The square root of 15870897 is about 3983.8294391201. The cubic root of 15870897 is about 251.3046305799.

The spelling of 15870897 in words is "fifteen million, eight hundred seventy thousand, eight hundred ninety-seven".