15887971 has 12 divisors (see below), whose sum is σ = 18297144. Its totient is φ = 13680000.

The previous prime is 15887959. The next prime is 15887983. The reversal of 15887971 is 17978851.

It is an interprime number because it is at equal distance from previous prime (15887959) and next prime (15887983).

It is a de Polignac number, because none of the positive numbers 2^k-15887971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15887071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1971 + ... + 5971.

It is an arithmetic number, because the mean of its divisors is an integer number (1524762).

Almost surely, 2^15887971 is an apocalyptic number.

15887971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15887971 is a deficient number, since it is larger than the sum of its proper divisors (2409173).

15887971 is a wasteful number, since it uses less digits than its factorization.

15887971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4031 counting only the distinct ones).

The product of its digits is 141120, while the sum is 46.

The square root of 15887971 is about 3985.9717761168. The cubic root of 15887971 is about 251.3947165929.

It can be divided in two parts, 1588 and 7971, that added together give a palindrome (9559).

The spelling of 15887971 in words is "fifteen million, eight hundred eighty-seven thousand, nine hundred seventy-one".