16624989 has 6 divisors (see below), whose sum is σ = 24013886. Its totient is φ = 11083320.

The previous prime is 16624939. The next prime is 16624999. The reversal of 16624989 is 98942661.

It is a happy number.

16624989 is a `hidden beast` number, since 16 + 624 + 9 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9253764 + 7371225 = 3042^2 + 2715^2 .

It is not a de Polignac number, because 16624989 - 2¹² = 16620893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16624919) 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 5 ways as a sum of consecutive naturals, for example, 923602 + ... + 923619.

Almost surely, 2^16624989 is an apocalyptic number.

It is an amenable number.

16624989 is a deficient number, since it is larger than the sum of its proper divisors (7388897).

16624989 is a wasteful number, since it uses less digits than its factorization.

16624989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847227 (or 1847224 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 16624989 is about 4077.3752586683. The cubic root of 16624989 is about 255.2233798102.

The spelling of 16624989 in words is "sixteen million, six hundred twenty-four thousand, nine hundred eighty-nine".