399910117 has 2 divisors, whose sum is σ = 399910118. Its totient is φ = 399910116.

The previous prime is 399910109. The next prime is 399910139. The reversal of 399910117 is 711019993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 321162241 + 78747876 = 17921^2 + 8874^2 .

It is a cyclic number.

It is not a de Polignac number, because 399910117 - 2³ = 399910109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399910117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399910817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199955058 + 199955059.

It is an arithmetic number, because the mean of its divisors is an integer number (199955059).

Almost surely, 2^399910117 is an apocalyptic number.

It is an amenable number.

399910117 is a deficient number, since it is larger than the sum of its proper divisors (1).

399910117 is an equidigital number, since it uses as much as digits as its factorization.

399910117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15309, while the sum is 40.

The square root of 399910117 is about 19997.7527987522. The cubic root of 399910117 is about 736.7511069599.

The spelling of 399910117 in words is "three hundred ninety-nine million, nine hundred ten thousand, one hundred seventeen".