391939238 has 8 divisors (see below), whose sum is σ = 601581288. Its totient is φ = 191412144.

The previous prime is 391939153. The next prime is 391939243. The reversal of 391939238 is 832939193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 391939192 and 391939201.

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, 2278631 + ... + 2278802.

It is an arithmetic number, because the mean of its divisors is an integer number (75197661).

Almost surely, 2^391939238 is an apocalyptic number.

391939238 is a deficient number, since it is larger than the sum of its proper divisors (209642050).

391939238 is a wasteful number, since it uses less digits than its factorization.

391939238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557478.

The product of its digits is 314928, while the sum is 47.

The square root of 391939238 is about 19797.4553415332. The cubic root of 391939238 is about 731.8233259803.

The spelling of 391939238 in words is "three hundred ninety-one million, nine hundred thirty-nine thousand, two hundred thirty-eight".