399000769 has 2 divisors, whose sum is σ = 399000770. Its totient is φ = 399000768.

The previous prime is 399000737. The next prime is 399000793. The reversal of 399000769 is 967000993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399000625 + 144 = 19975^2 + 12^2 .

It is a cyclic number.

It is not a de Polignac number, because 399000769 - 2⁵ = 399000737 is a prime.

It is a super-2 number, since 2×399000769² = 318403227325182722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399000709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199500384 + 199500385.

It is an arithmetic number, because the mean of its divisors is an integer number (199500385).

Almost surely, 2^399000769 is an apocalyptic number.

It is an amenable number.

399000769 is a deficient number, since it is larger than the sum of its proper divisors (1).

399000769 is an equidigital number, since it uses as much as digits as its factorization.

399000769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 43.

The square root of 399000769 is about 19975.0036045053. The cubic root of 399000769 is about 736.1922550537.

The spelling of 399000769 in words is "three hundred ninety-nine million, seven hundred sixty-nine", and thus it is an aban number.