393397057 has 4 divisors (see below), whose sum is σ = 395752896. Its totient is φ = 391041220.

The previous prime is 393397049. The next prime is 393397079. The reversal of 393397057 is 750793393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393397057 - 2³ = 393397049 is a prime.

It is a super-2 number, since 2×393397057² = 309522488912522498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 393396998 and 393397016.

It is not an unprimeable number, because it can be changed into a prime (393397087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1177669 + ... + 1178002.

It is an arithmetic number, because the mean of its divisors is an integer number (98938224).

Almost surely, 2^393397057 is an apocalyptic number.

It is an amenable number.

393397057 is a deficient number, since it is larger than the sum of its proper divisors (2355839).

393397057 is a wasteful number, since it uses less digits than its factorization.

393397057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2355838.

The product of its (nonzero) digits is 535815, while the sum is 46.

The square root of 393397057 is about 19834.2395115114. The cubic root of 393397057 is about 732.7295429272.

The spelling of 393397057 in words is "three hundred ninety-three million, three hundred ninety-seven thousand, fifty-seven".