393117939 has 12 divisors (see below), whose sum is σ = 587418000. Its totient is φ = 253041264.

The previous prime is 393117887. The next prime is 393117941. The reversal of 393117939 is 939711393.

It is not a de Polignac number, because 393117939 - 2⁹ = 393117427 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 393117894 and 393117903.

It is not an unprimeable number, because it can be changed into a prime (393117839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 752839 + ... + 753360.

It is an arithmetic number, because the mean of its divisors is an integer number (48951500).

Almost surely, 2^393117939 is an apocalyptic number.

393117939 is a deficient number, since it is larger than the sum of its proper divisors (194300061).

393117939 is a wasteful number, since it uses less digits than its factorization.

393117939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506234 (or 1506231 counting only the distinct ones).

The product of its digits is 137781, while the sum is 45.

The square root of 393117939 is about 19827.2019962475. The cubic root of 393117939 is about 732.5562096591.

The spelling of 393117939 in words is "three hundred ninety-three million, one hundred seventeen thousand, nine hundred thirty-nine".