16408999 has 2 divisors, whose sum is σ = 16409000. Its totient is φ = 16408998.

The previous prime is 16408993. The next prime is 16409039. The reversal of 16408999 is 99980461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16408999 - 2¹⁵ = 16376231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16408993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8204499 + 8204500.

It is an arithmetic number, because the mean of its divisors is an integer number (8204500).

Almost surely, 2^16408999 is an apocalyptic number.

16408999 is a deficient number, since it is larger than the sum of its proper divisors (1).

16408999 is an equidigital number, since it uses as much as digits as its factorization.

16408999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 16408999 is about 4050.8022662184. The cubic root of 16408999 is about 254.1132805309.

The spelling of 16408999 in words is "sixteen million, four hundred eight thousand, nine hundred ninety-nine".