393917239 has 4 divisors (see below), whose sum is σ = 396426424. Its totient is φ = 391408056.

The previous prime is 393917233. The next prime is 393917261. The reversal of 393917239 is 932719393.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 393917239 - 2¹¹ = 393915191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393917233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1254357 + ... + 1254670.

It is an arithmetic number, because the mean of its divisors is an integer number (99106606).

Almost surely, 2^393917239 is an apocalyptic number.

393917239 is a deficient number, since it is larger than the sum of its proper divisors (2509185).

393917239 is a wasteful number, since it uses less digits than its factorization.

393917239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2509184.

The product of its digits is 275562, while the sum is 46.

The square root of 393917239 is about 19847.3484123195. The cubic root of 393917239 is about 733.0523591409.

The spelling of 393917239 in words is "three hundred ninety-three million, nine hundred seventeen thousand, two hundred thirty-nine".