16638988 has 12 divisors (see below), whose sum is σ = 30831192. Its totient is φ = 7830080.

The previous prime is 16638983. The next prime is 16638991. The reversal of 16638988 is 88983661.

It is not an unprimeable number, because it can be changed into a prime (16638983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122278 + ... + 122413.

It is an arithmetic number, because the mean of its divisors is an integer number (2569266).

Almost surely, 2^16638988 is an apocalyptic number.

It is an amenable number.

16638988 is a deficient number, since it is larger than the sum of its proper divisors (14192204).

16638988 is a wasteful number, since it uses less digits than its factorization.

16638988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244712 (or 244710 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 16638988 is about 4079.0915655327. The cubic root of 16638988 is about 255.2949962931.

The spelling of 16638988 in words is "sixteen million, six hundred thirty-eight thousand, nine hundred eighty-eight".