399780793 has 2 divisors, whose sum is σ = 399780794. Its totient is φ = 399780792.

The previous prime is 399780757. The next prime is 399780811. The reversal of 399780793 is 397087993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 307371024 + 92409769 = 17532^2 + 9613^2 .

It is a cyclic number.

It is not a de Polignac number, because 399780793 - 2²⁵ = 366226361 is a prime.

It is not a weakly prime, because it can be changed into another prime (399780713) 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 as a sum of consecutive naturals, namely, 199890396 + 199890397.

It is an arithmetic number, because the mean of its divisors is an integer number (199890397).

Almost surely, 2^399780793 is an apocalyptic number.

It is an amenable number.

399780793 is a deficient number, since it is larger than the sum of its proper divisors (1).

399780793 is an equidigital number, since it uses as much as digits as its factorization.

399780793 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The square root of 399780793 is about 19994.5190739863. The cubic root of 399780793 is about 736.6716808851.

The spelling of 399780793 in words is "three hundred ninety-nine million, seven hundred eighty thousand, seven hundred ninety-three".