399009419 has 2 divisors, whose sum is σ = 399009420. Its totient is φ = 399009418.

The previous prime is 399009379. The next prime is 399009503. The reversal of 399009419 is 914900993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399009419 - 2¹² = 399005323 is a prime.

It is a super-2 number, since 2×399009419² = 318417032901435122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399009419.

It is not a weakly prime, because it can be changed into another prime (399009319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199504709 + 199504710.

It is an arithmetic number, because the mean of its divisors is an integer number (199504710).

Almost surely, 2^399009419 is an apocalyptic number.

399009419 is a deficient number, since it is larger than the sum of its proper divisors (1).

399009419 is an equidigital number, since it uses as much as digits as its factorization.

399009419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 399009419 is about 19975.2201239436. The cubic root of 399009419 is about 736.1975750243.

The spelling of 399009419 in words is "three hundred ninety-nine million, nine thousand, four hundred nineteen".