393418916 has 18 divisors (see below), whose sum is σ = 756763350. Its totient is φ = 178826560.

The previous prime is 393418897. The next prime is 393418943. The reversal of 393418916 is 619814393.

It can be written as a sum of positive squares in only one way, i.e., 355473316 + 37945600 = 18854^2 + 6160^2 .

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 405941 + ... + 406908.

Almost surely, 2^393418916 is an apocalyptic number.

It is an amenable number.

393418916 is a deficient number, since it is larger than the sum of its proper divisors (363344434).

393418916 is a wasteful number, since it uses less digits than its factorization.

393418916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812875 (or 812862 counting only the distinct ones).

The product of its digits is 139968, while the sum is 44.

The square root of 393418916 is about 19834.7905459070. The cubic root of 393418916 is about 732.7431139815.

The spelling of 393418916 in words is "three hundred ninety-three million, four hundred eighteen thousand, nine hundred sixteen".