399099443 has 2 divisors, whose sum is σ = 399099444. Its totient is φ = 399099442.

The previous prime is 399099433. The next prime is 399099499. The reversal of 399099443 is 344990993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399099443 - 2¹⁰ = 399098419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399099391 and 399099400.

It is not a weakly prime, because it can be changed into another prime (399099403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199549721 + 199549722.

It is an arithmetic number, because the mean of its divisors is an integer number (199549722).

Almost surely, 2^399099443 is an apocalyptic number.

399099443 is a deficient number, since it is larger than the sum of its proper divisors (1).

399099443 is an equidigital number, since it uses as much as digits as its factorization.

399099443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 944784, while the sum is 50.

The square root of 399099443 is about 19977.4733887947. The cubic root of 399099443 is about 736.2529375158.

The spelling of 399099443 in words is "three hundred ninety-nine million, ninety-nine thousand, four hundred forty-three".