391317914 has 16 divisors (see below), whose sum is σ = 633022152. Its totient is φ = 180353088.

The previous prime is 391317853. The next prime is 391317919. The reversal of 391317914 is 419713193.

It can be written as a sum of positive squares in 4 ways, for example, as 379587289 + 11730625 = 19483^2 + 3425^2 .

It is a super-2 number, since 2×391317914² = 306259419634622792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (391317919) 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, 8792 + ... + 29324.

Almost surely, 2^391317914 is an apocalyptic number.

391317914 is a deficient number, since it is larger than the sum of its proper divisors (241704238).

391317914 is a wasteful number, since it uses less digits than its factorization.

391317914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21281.

The product of its digits is 20412, while the sum is 38.

The square root of 391317914 is about 19781.7571009251. The cubic root of 391317914 is about 731.4364123676.

It can be divided in two parts, 3913179 and 14, that added together give a palindrome (3913193).

The spelling of 391317914 in words is "three hundred ninety-one million, three hundred seventeen thousand, nine hundred fourteen".