16445399 has 2 divisors, whose sum is σ = 16445400. Its totient is φ = 16445398.

The previous prime is 16445389. The next prime is 16445419. The reversal of 16445399 is 99354461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16445399 - 2⁴ = 16445383 is a prime.

It is a super-2 number, since 2×16445399² = 540902296538402, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16445309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8222699 + 8222700.

It is an arithmetic number, because the mean of its divisors is an integer number (8222700).

Almost surely, 2^16445399 is an apocalyptic number.

16445399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16445399 is an equidigital number, since it uses as much as digits as its factorization.

16445399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 41.

The square root of 16445399 is about 4055.2927144659. The cubic root of 16445399 is about 254.3010411674.

The spelling of 16445399 in words is "sixteen million, four hundred forty-five thousand, three hundred ninety-nine".