393977039 has 2 divisors, whose sum is σ = 393977040. Its totient is φ = 393977038.

The previous prime is 393976997. The next prime is 393977071. The reversal of 393977039 is 930779393.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393977039 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393977239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196988519 + 196988520.

It is an arithmetic number, because the mean of its divisors is an integer number (196988520).

Almost surely, 2^393977039 is an apocalyptic number.

393977039 is a deficient number, since it is larger than the sum of its proper divisors (1).

393977039 is an equidigital number, since it uses as much as digits as its factorization.

393977039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 964467, while the sum is 50.

The square root of 393977039 is about 19848.8548536181. The cubic root of 393977039 is about 733.0894517995.

The spelling of 393977039 in words is "three hundred ninety-three million, nine hundred seventy-seven thousand, thirty-nine".