399492517 has 2 divisors, whose sum is σ = 399492518. Its totient is φ = 399492516.

The previous prime is 399492449. The next prime is 399492539. The reversal of 399492517 is 715294993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214505316 + 184987201 = 14646^2 + 13601^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399492517 is a prime.

It is a super-2 number, since 2×399492517² = 319188542277990578, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399492017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199746258 + 199746259.

It is an arithmetic number, because the mean of its divisors is an integer number (199746259).

Almost surely, 2^399492517 is an apocalyptic number.

It is an amenable number.

399492517 is a deficient number, since it is larger than the sum of its proper divisors (1).

399492517 is an equidigital number, since it uses as much as digits as its factorization.

399492517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 49.

The square root of 399492517 is about 19987.3088983985. The cubic root of 399492517 is about 736.4945706337.

The spelling of 399492517 in words is "three hundred ninety-nine million, four hundred ninety-two thousand, five hundred seventeen".