16639330 has 32 divisors (see below), whose sum is σ = 31253040. Its totient is φ = 6370560.

The previous prime is 16639289. The next prime is 16639333. The reversal of 16639330 is 3393661.

It can be written as a sum of positive squares in 8 ways, for example, as 212521 + 16426809 = 461^2 + 4053^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16639292 and 16639301.

It is not an unprimeable number, because it can be changed into a prime (16639333) 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, 52332 + ... + 52648.

Almost surely, 2^16639330 is an apocalyptic number.

16639330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16639330 is a deficient number, since it is larger than the sum of its proper divisors (14613710).

16639330 is a wasteful number, since it uses less digits than its factorization.

16639330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 8748, while the sum is 31.

The square root of 16639330 is about 4079.1334864160. The cubic root of 16639330 is about 255.2967454037.

The spelling of 16639330 in words is "sixteen million, six hundred thirty-nine thousand, three hundred thirty".