315987 has 16 divisors (see below), whose sum is σ = 494592. Its totient is φ = 175680.

The previous prime is 315977. The next prime is 316003. The reversal of 315987 is 789513.

It is not a de Polignac number, because 315987 - 2¹⁴ = 299603 is a prime.

It is an Ulam number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 315987.

It is not an unprimeable number, because it can be changed into a prime (315907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 678 + ... + 1044.

It is an arithmetic number, because the mean of its divisors is an integer number (30912).

2³¹⁵⁹⁸⁷ is an apocalyptic number.

315987 is a deficient number, since it is larger than the sum of its proper divisors (178605).

315987 is a wasteful number, since it uses less digits than its factorization.

315987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418.

The product of its digits is 7560, while the sum is 33.

The square root of 315987 is about 562.1272098022. The cubic root of 315987 is about 68.1119120272. Note that the first 3 decimals are identical.

It can be divided in two parts, 3 and 15987, that multiplied together give a square (47961 = 219²).

The spelling of 315987 in words is "three hundred fifteen thousand, nine hundred eighty-seven".