312187993 has 32 divisors (see below), whose sum is σ = 372556800. Its totient is φ = 258831936.

The previous prime is 312187979. The next prime is 312188029. The reversal of 312187993 is 399781213.

It is a cyclic number.

It is not a de Polignac number, because 312187993 - 2⁵ = 312187961 is a prime.

It is a super-2 number, since 2×312187993² = 194922685946736098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312187913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016746 + ... + 1017052.

It is an arithmetic number, because the mean of its divisors is an integer number (11642400).

Almost surely, 2^312187993 is an apocalyptic number.

It is an amenable number.

312187993 is a deficient number, since it is larger than the sum of its proper divisors (60368807).

312187993 is a wasteful number, since it uses less digits than its factorization.

312187993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its digits is 81648, while the sum is 43.

The square root of 312187993 is about 17668.8424352021. The cubic root of 312187993 is about 678.3784843316.

The spelling of 312187993 in words is "three hundred twelve million, one hundred eighty-seven thousand, nine hundred ninety-three".