393950399 has 4 divisors (see below), whose sum is σ = 397851000. Its totient is φ = 390049800.

The previous prime is 393950369. The next prime is 393950407. The reversal of 393950399 is 993059393.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 993059393 = 83 ⋅11964571.

It is a cyclic number.

It is not a de Polignac number, because 393950399 - 2²⁸ = 125514943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393950309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1950149 + ... + 1950350.

It is an arithmetic number, because the mean of its divisors is an integer number (99462750).

Almost surely, 2^393950399 is an apocalyptic number.

393950399 is a deficient number, since it is larger than the sum of its proper divisors (3900601).

393950399 is a wasteful number, since it uses less digits than its factorization.

393950399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3900600.

The product of its (nonzero) digits is 885735, while the sum is 50.

The square root of 393950399 is about 19848.1837708139. The cubic root of 393950399 is about 733.0729280420.

The spelling of 393950399 in words is "three hundred ninety-three million, nine hundred fifty thousand, three hundred ninety-nine".