399600917 has 2 divisors, whose sum is σ = 399600918. Its totient is φ = 399600916.

The previous prime is 399600893. The next prime is 399600937. The reversal of 399600917 is 719006993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 325658116 + 73942801 = 18046^2 + 8599^2 .

It is a cyclic number.

It is not a de Polignac number, because 399600917 - 2⁸ = 399600661 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 (399600937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199800458 + 199800459.

It is an arithmetic number, because the mean of its divisors is an integer number (199800459).

Almost surely, 2^399600917 is an apocalyptic number.

It is an amenable number.

399600917 is a deficient number, since it is larger than the sum of its proper divisors (1).

399600917 is an equidigital number, since it uses as much as digits as its factorization.

399600917 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 44.

The square root of 399600917 is about 19990.0204352072. The cubic root of 399600917 is about 736.5611791333.

The spelling of 399600917 in words is "three hundred ninety-nine million, six hundred thousand, nine hundred seventeen".