312871985 has 16 divisors (see below), whose sum is σ = 389033280. Its totient is φ = 241400640.

The previous prime is 312871973. The next prime is 312871991. The reversal of 312871985 is 589178213.

It is not a de Polignac number, because 312871985 - 2¹⁶ = 312806449 is a prime.

It is a Curzon number.

It is an unprimeable 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 in 15 ways as a sum of consecutive naturals, for example, 5630 + ... + 25640.

It is an arithmetic number, because the mean of its divisors is an integer number (24314580).

Almost surely, 2^312871985 is an apocalyptic number.

It is an amenable number.

312871985 is a deficient number, since it is larger than the sum of its proper divisors (76161295).

312871985 is a wasteful number, since it uses less digits than its factorization.

312871985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20128.

The product of its digits is 120960, while the sum is 44.

The square root of 312871985 is about 17688.1877251458. The cubic root of 312871985 is about 678.8735567514.

The spelling of 312871985 in words is "three hundred twelve million, eight hundred seventy-one thousand, nine hundred eighty-five".