394139506 has 8 divisors (see below), whose sum is σ = 591836400. Its totient is φ = 196860708.

The previous prime is 394139497. The next prime is 394139513. The reversal of 394139506 is 605931493.

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

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, 102156 + ... + 105943.

It is an arithmetic number, because the mean of its divisors is an integer number (73979550).

Almost surely, 2^394139506 is an apocalyptic number.

394139506 is a deficient number, since it is larger than the sum of its proper divisors (197696894).

394139506 is a wasteful number, since it uses less digits than its factorization.

394139506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209048.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 394139506 is about 19852.9470356418. The cubic root of 394139506 is about 733.1902076509.

The spelling of 394139506 in words is "three hundred ninety-four million, one hundred thirty-nine thousand, five hundred six".