393959217 has 16 divisors (see below), whose sum is σ = 537219072. Its totient is φ = 256685520.

The previous prime is 393959149. The next prime is 393959219. The reversal of 393959217 is 712959393.

It is not a de Polignac number, because 393959217 - 2⁷ = 393959089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (393959219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126918 + ... + 129984.

It is an arithmetic number, because the mean of its divisors is an integer number (33576192).

Almost surely, 2^393959217 is an apocalyptic number.

It is an amenable number.

393959217 is a deficient number, since it is larger than the sum of its proper divisors (143259855).

393959217 is a wasteful number, since it uses less digits than its factorization.

393959217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028.

The product of its digits is 459270, while the sum is 48.

The square root of 393959217 is about 19848.4059057648. The cubic root of 393959217 is about 733.0783975874.

The spelling of 393959217 in words is "three hundred ninety-three million, nine hundred fifty-nine thousand, two hundred seventeen".