16627989 has 32 divisors (see below), whose sum is σ = 27426816. Its totient is φ = 8743680.

The previous prime is 16627981. The next prime is 16628009. The reversal of 16627989 is 98972661.

It is not a de Polignac number, because 16627989 - 2³ = 16627981 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16627981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16284 + ... + 17274.

It is an arithmetic number, because the mean of its divisors is an integer number (857088).

Almost surely, 2^16627989 is an apocalyptic number.

It is an amenable number.

16627989 is a deficient number, since it is larger than the sum of its proper divisors (10798827).

16627989 is a wasteful number, since it uses less digits than its factorization.

16627989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065.

The product of its digits is 326592, while the sum is 48.

The square root of 16627989 is about 4077.7431257989. The cubic root of 16627989 is about 255.2387306793.

The spelling of 16627989 in words is "sixteen million, six hundred twenty-seven thousand, nine hundred eighty-nine".