312897705 has 16 divisors (see below), whose sum is σ = 508110144. Its totient is φ = 164387520.

The previous prime is 312897701. The next prime is 312897707. The reversal of 312897705 is 507798213.

312897705 = 398² + 399² + ... + 1000².

It is not a de Polignac number, because 312897705 - 2² = 312897701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (312897701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154666 + ... + 156675.

It is an arithmetic number, because the mean of its divisors is an integer number (31756884).

Almost surely, 2^312897705 is an apocalyptic number.

It is an amenable number.

312897705 is a deficient number, since it is larger than the sum of its proper divisors (195212439).

312897705 is a wasteful number, since it uses less digits than its factorization.

312897705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311416.

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 312897705 is about 17688.9147490738. The cubic root of 312897705 is about 678.8921587679.

The spelling of 312897705 in words is "three hundred twelve million, eight hundred ninety-seven thousand, seven hundred five".