393939399 has 8 divisors (see below), whose sum is σ = 600288640. Its totient is φ = 225108216.

The previous prime is 393939397. The next prime is 393939409. The reversal of 393939399 is 993939393.

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

It is not a de Polignac number, because 393939399 - 2¹ = 393939397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393939397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9379489 + ... + 9379530.

It is an arithmetic number, because the mean of its divisors is an integer number (75036080).

Almost surely, 2^393939399 is an apocalyptic number.

393939399 is a deficient number, since it is larger than the sum of its proper divisors (206349241).

393939399 is a wasteful number, since it uses less digits than its factorization.

393939399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18759029.

The product of its digits is 4782969, while the sum is 57.

The square root of 393939399 is about 19847.9066654396. The cubic root of 393939399 is about 733.0661049518.

The spelling of 393939399 in words is "three hundred ninety-three million, nine hundred thirty-nine thousand, three hundred ninety-nine".