393949399 has 2 divisors, whose sum is σ = 393949400. Its totient is φ = 393949398.

The previous prime is 393949373. The next prime is 393949403. The reversal of 393949399 is 993949393.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 393949399 - 2⁹ = 393948887 is a prime.

It is a super-2 number, since 2×393949399² = 310392257944922402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393949799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196974699 + 196974700.

It is an arithmetic number, because the mean of its divisors is an integer number (196974700).

Almost surely, 2^393949399 is an apocalyptic number.

393949399 is a deficient number, since it is larger than the sum of its proper divisors (1).

393949399 is an equidigital number, since it uses as much as digits as its factorization.

393949399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6377292, while the sum is 58.

The square root of 393949399 is about 19848.1585795761. The cubic root of 393949399 is about 733.0723077663.

The spelling of 393949399 in words is "three hundred ninety-three million, nine hundred forty-nine thousand, three hundred ninety-nine".