16648989 has 16 divisors (see below), whose sum is σ = 25446528. Its totient is φ = 9484992.

The previous prime is 16648981. The next prime is 16648991. The reversal of 16648989 is 98984661.

It is a happy number.

It is not a de Polignac number, because 16648989 - 2³ = 16648981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16648981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7339 + ... + 9335.

It is an arithmetic number, because the mean of its divisors is an integer number (1590408).

Almost surely, 2^16648989 is an apocalyptic number.

It is an amenable number.

16648989 is a deficient number, since it is larger than the sum of its proper divisors (8797539).

16648989 is a wasteful number, since it uses less digits than its factorization.

16648989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404.

The product of its digits is 746496, while the sum is 51.

The square root of 16648989 is about 4080.3172670762. The cubic root of 16648989 is about 255.3461350981.

The spelling of 16648989 in words is "sixteen million, six hundred forty-eight thousand, nine hundred eighty-nine".