399337296209 has 2 divisors, whose sum is σ = 399337296210. Its totient is φ = 399337296208.

The previous prime is 399337296167. The next prime is 399337296229. The reversal of 399337296209 is 902692733993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382894876225 + 16442419984 = 618785^2 + 128228^2 .

It is an emirp because it is prime and its reverse (902692733993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399337296209 - 2²⁰ = 399336247633 is a prime.

It is a super-2 number, since 2×399337296209² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399337296229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199668648104 + 199668648105.

It is an arithmetic number, because the mean of its divisors is an integer number (199668648105).

Almost surely, 2^399337296209 is an apocalyptic number.

It is an amenable number.

399337296209 is a deficient number, since it is larger than the sum of its proper divisors (1).

399337296209 is an equidigital number, since it uses as much as digits as its factorization.

399337296209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29760696, while the sum is 62.

The spelling of 399337296209 in words is "three hundred ninety-nine billion, three hundred thirty-seven million, two hundred ninety-six thousand, two hundred nine".