312499985 has 8 divisors (see below), whose sum is σ = 428571456. Its totient is φ = 214285680.

The previous prime is 312499961. The next prime is 312499987. The reversal of 312499985 is 589994213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 312499985 - 2¹² = 312495889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312499987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4464251 + ... + 4464320.

It is an arithmetic number, because the mean of its divisors is an integer number (53571432).

Almost surely, 2^312499985 is an apocalyptic number.

312499985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

312499985 is a deficient number, since it is larger than the sum of its proper divisors (116071471).

312499985 is an equidigital number, since it uses as much as digits as its factorization.

312499985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8928583.

The product of its digits is 699840, while the sum is 50.

The square root of 312499985 is about 17677.6691053996. The cubic root of 312499985 is about 678.6043932911.

The spelling of 312499985 in words is "three hundred twelve million, four hundred ninety-nine thousand, nine hundred eighty-five".