312138697 has 8 divisors (see below), whose sum is σ = 345235016. Its totient is φ = 280340352.

The previous prime is 312138691. The next prime is 312138713. The reversal of 312138697 is 796831213.

It can be written as a sum of positive squares in 4 ways, for example, as 50637456 + 261501241 = 7116^2 + 16171^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 312138697 - 2³ = 312138689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312138691) 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, 323988 + ... + 324949.

It is an arithmetic number, because the mean of its divisors is an integer number (43154377).

Almost surely, 2^312138697 is an apocalyptic number.

312138697 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

312138697 is a deficient number, since it is larger than the sum of its proper divisors (33096319).

312138697 is a wasteful number, since it uses less digits than its factorization.

312138697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648987.

The product of its digits is 54432, while the sum is 40.

The square root of 312138697 is about 17667.4473821206. The cubic root of 312138697 is about 678.3427760331.

The spelling of 312138697 in words is "three hundred twelve million, one hundred thirty-eight thousand, six hundred ninety-seven".