18669738 has 16 divisors (see below), whose sum is σ = 37683360. Its totient is φ = 6165936.

The previous prime is 18669737. The next prime is 18669743. The reversal of 18669738 is 83796681.

It is not an unprimeable number, because it can be changed into a prime (18669731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13620 + ... + 14927.

It is an arithmetic number, because the mean of its divisors is an integer number (2355210).

Almost surely, 2^18669738 is an apocalyptic number.

18669738 is an abundant number, since it is smaller than the sum of its proper divisors (19013622).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18669738 is a wasteful number, since it uses less digits than its factorization.

18669738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28661.

The product of its digits is 435456, while the sum is 48.

The square root of 18669738 is about 4320.8492220859. The cubic root of 18669738 is about 265.2850285512.

The spelling of 18669738 in words is "eighteen million, six hundred sixty-nine thousand, seven hundred thirty-eight".