393351988 has 12 divisors (see below), whose sum is σ = 688790592. Its totient is φ = 196554680.

The previous prime is 393351979. The next prime is 393352007. The reversal of 393351988 is 889153393.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22828 + ... + 36163.

It is an arithmetic number, because the mean of its divisors is an integer number (57399216).

Almost surely, 2^393351988 is an apocalyptic number.

It is an amenable number.

393351988 is a deficient number, since it is larger than the sum of its proper divisors (295438604).

393351988 is a wasteful number, since it uses less digits than its factorization.

393351988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60662 (or 60660 counting only the distinct ones).

The product of its digits is 699840, while the sum is 49.

The square root of 393351988 is about 19833.1033376020. The cubic root of 393351988 is about 732.7015604700.

The spelling of 393351988 in words is "three hundred ninety-three million, three hundred fifty-one thousand, nine hundred eighty-eight".