393924394 has 4 divisors (see below), whose sum is σ = 590886594. Its totient is φ = 196962196.

The previous prime is 393924389. The next prime is 393924431. The reversal of 393924394 is 493429393.

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

It can be written as a sum of positive squares in only one way, i.e., 273737025 + 120187369 = 16545^2 + 10963^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98481097 + ... + 98481100.

Almost surely, 2^393924394 is an apocalyptic number.

393924394 is a deficient number, since it is larger than the sum of its proper divisors (196962200).

393924394 is a wasteful number, since it uses less digits than its factorization.

393924394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196962199.

The product of its digits is 629856, while the sum is 46.

The square root of 393924394 is about 19847.5286622793. The cubic root of 393924394 is about 733.0567974318.

The spelling of 393924394 in words is "three hundred ninety-three million, nine hundred twenty-four thousand, three hundred ninety-four".