16445939 has 4 divisors (see below), whose sum is σ = 16467624. Its totient is φ = 16424256.

The previous prime is 16445893. The next prime is 16445969. The reversal of 16445939 is 93954461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16445939 - 2²⁰ = 15397363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16445896 and 16445905.

It is not an unprimeable number, because it can be changed into a prime (16445969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9662 + ... + 11235.

It is an arithmetic number, because the mean of its divisors is an integer number (4116906).

Almost surely, 2^16445939 is an apocalyptic number.

16445939 is a deficient number, since it is larger than the sum of its proper divisors (21685).

16445939 is an equidigital number, since it uses as much as digits as its factorization.

16445939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21684.

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

The square root of 16445939 is about 4055.3592935768. The cubic root of 16445939 is about 254.3038245408.

The spelling of 16445939 in words is "sixteen million, four hundred forty-five thousand, nine hundred thirty-nine".