15868 has 6 divisors (see below), whose sum is σ = 27776. Its totient is φ = 7932.

The previous prime is 15859. The next prime is 15877. The reversal of 15868 is 86851.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (15859) and next prime (15877).

It is a congruent number.

It is an unprimeable number.

15868 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 1980 + ... + 1987.

2¹⁵⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

15868 is a deficient number, since it is larger than the sum of its proper divisors (11908).

15868 is a wasteful number, since it uses less digits than its factorization.

15868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3971 (or 3969 counting only the distinct ones).

The product of its digits is 1920, while the sum is 28.

The square root of 15868 is about 125.9682499680. The cubic root of 15868 is about 25.1289338988.

The spelling of 15868 in words is "fifteen thousand, eight hundred sixty-eight".