393840994 has 8 divisors (see below), whose sum is σ = 590881500. Its totient is φ = 196880496.

The previous prime is 393840973. The next prime is 393841003. The reversal of 393840994 is 499048393.

It can be written as a sum of positive squares in 2 ways, for example, as 305725225 + 88115769 = 17485^2 + 9387^2 .

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

It is a super-2 number, since 2×393840994² = 310221457109816072, which contains 22 as substring.

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, 5629 + ... + 28624.

Almost surely, 2^393840994 is an apocalyptic number.

393840994 is a deficient number, since it is larger than the sum of its proper divisors (197040506).

393840994 is a wasteful number, since it uses less digits than its factorization.

393840994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40004.

The product of its (nonzero) digits is 839808, while the sum is 49.

The square root of 393840994 is about 19845.4275338175. The cubic root of 393840994 is about 733.0050605563.

The spelling of 393840994 in words is "three hundred ninety-three million, eight hundred forty thousand, nine hundred ninety-four".