312978838 has 4 divisors (see below), whose sum is σ = 469468260. Its totient is φ = 156489418.

The previous prime is 312978761. The next prime is 312978851. The reversal of 312978838 is 838879213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 838879213 = 16333 ⋅51361.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 312978791 and 312978800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78244708 + ... + 78244711.

It is an arithmetic number, because the mean of its divisors is an integer number (117367065).

Almost surely, 2^312978838 is an apocalyptic number.

312978838 is a deficient number, since it is larger than the sum of its proper divisors (156489422).

312978838 is a wasteful number, since it uses less digits than its factorization.

312978838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156489421.

The product of its digits is 580608, while the sum is 49.

The square root of 312978838 is about 17691.2079293642. The cubic root of 312978838 is about 678.9508316148.

The spelling of 312978838 in words is "three hundred twelve million, nine hundred seventy-eight thousand, eight hundred thirty-eight".