16638964 has 6 divisors (see below), whose sum is σ = 29118194. Its totient is φ = 8319480.

The previous prime is 16638961. The next prime is 16638983. The reversal of 16638964 is 46983661.

It can be written as a sum of positive squares in only one way, i.e., 9120400 + 7518564 = 3020^2 + 2742^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16638964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16638961) 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 as a sum of consecutive naturals, namely, 2079867 + ... + 2079874.

Almost surely, 2^16638964 is an apocalyptic number.

It is an amenable number.

16638964 is a deficient number, since it is larger than the sum of its proper divisors (12479230).

16638964 is a wasteful number, since it uses less digits than its factorization.

16638964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4159745 (or 4159743 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 16638964 is about 4079.0886237002. The cubic root of 16638964 is about 255.2948735476.

The spelling of 16638964 in words is "sixteen million, six hundred thirty-eight thousand, nine hundred sixty-four".