399505259 has 2 divisors, whose sum is σ = 399505260. Its totient is φ = 399505258.

The previous prime is 399505241. The next prime is 399505319. The reversal of 399505259 is 952505993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399505259 - 2¹⁶ = 399439723 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (399505759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199752629 + 199752630.

It is an arithmetic number, because the mean of its divisors is an integer number (199752630).

Almost surely, 2^399505259 is an apocalyptic number.

399505259 is a deficient number, since it is larger than the sum of its proper divisors (1).

399505259 is an equidigital number, since it uses as much as digits as its factorization.

399505259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 546750, while the sum is 47.

The square root of 399505259 is about 19987.6276481227. The cubic root of 399505259 is about 736.5024008296.

The spelling of 399505259 in words is "three hundred ninety-nine million, five hundred five thousand, two hundred fifty-nine".