18987366 has 16 divisors (see below), whose sum is σ = 38023488. Its totient is φ = 6321000.

The previous prime is 18987361. The next prime is 18987377. The reversal of 18987366 is 66378981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18987361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4801 + ... + 7811.

It is an arithmetic number, because the mean of its divisors is an integer number (2376468).

Almost surely, 2^18987366 is an apocalyptic number.

18987366 is an abundant number, since it is smaller than the sum of its proper divisors (19036122).

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

18987366 is a wasteful number, since it uses less digits than its factorization.

18987366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4067.

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

The square root of 18987366 is about 4357.4494833561. The cubic root of 18987366 is about 266.7810068695.

The spelling of 18987366 in words is "eighteen million, nine hundred eighty-seven thousand, three hundred sixty-six".