312818399 has 4 divisors (see below), whose sum is σ = 315281664. Its totient is φ = 310355136.

The previous prime is 312818381. The next prime is 312818449. The reversal of 312818399 is 993818213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993818213 = 2239 ⋅443867.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312818399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312818339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1231442 + ... + 1231695.

It is an arithmetic number, because the mean of its divisors is an integer number (78820416).

Almost surely, 2^312818399 is an apocalyptic number.

312818399 is a deficient number, since it is larger than the sum of its proper divisors (2463265).

312818399 is a wasteful number, since it uses less digits than its factorization.

312818399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2463264.

The product of its digits is 93312, while the sum is 44.

The square root of 312818399 is about 17686.6729205919. The cubic root of 312818399 is about 678.8347973469.

The spelling of 312818399 in words is "three hundred twelve million, eight hundred eighteen thousand, three hundred ninety-nine".