318391426 has 4 divisors (see below), whose sum is σ = 477587142. Its totient is φ = 159195712.

The previous prime is 318391397. The next prime is 318391427. The reversal of 318391426 is 624193813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624193813 = 1049 ⋅595037.

It can be written as a sum of positive squares in only one way, i.e., 200647225 + 117744201 = 14165^2 + 10851^2 .

It is not an unprimeable number, because it can be changed into a prime (318391427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79597855 + ... + 79597858.

Almost surely, 2^318391426 is an apocalyptic number.

318391426 is a deficient number, since it is larger than the sum of its proper divisors (159195716).

318391426 is a wasteful number, since it uses less digits than its factorization.

318391426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159195715.

The product of its digits is 31104, while the sum is 37.

The square root of 318391426 is about 17843.5261649709. The cubic root of 318391426 is about 682.8423600453.

The spelling of 318391426 in words is "three hundred eighteen million, three hundred ninety-one thousand, four hundred twenty-six".