399617 has 2 divisors, whose sum is σ = 399618. Its totient is φ = 399616.

The previous prime is 399613. The next prime is 399643. The reversal of 399617 is 716993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361201 + 38416 = 601^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 399617 - 2² = 399613 is a prime.

It is not a weakly prime, because it can be changed into another prime (399613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199808 + 199809.

It is an arithmetic number, because the mean of its divisors is an integer number (199809).

2³⁹⁹⁶¹⁷ is an apocalyptic number.

It is an amenable number.

399617 is a deficient number, since it is larger than the sum of its proper divisors (1).

399617 is an equidigital number, since it uses as much as digits as its factorization.

399617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10206, while the sum is 35.

The square root of 399617 is about 632.1526714331. The cubic root of 399617 is about 73.6571060621.

The spelling of 399617 in words is "three hundred ninety-nine thousand, six hundred seventeen".