18881764 has 24 divisors (see below), whose sum is σ = 38168928. Its totient is φ = 8077440.

The previous prime is 18881761. The next prime is 18881777. The reversal of 18881764 is 46718881.

It is a self number, because there is not a number n which added to its sum of digits gives 18881764.

It is not an unprimeable number, because it can be changed into a prime (18881761) 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, 11874 + ... + 13369.

It is an arithmetic number, because the mean of its divisors is an integer number (1590372).

Almost surely, 2^18881764 is an apocalyptic number.

It is an amenable number.

18881764 is an abundant number, since it is smaller than the sum of its proper divisors (19287164).

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

18881764 is a wasteful number, since it uses less digits than its factorization.

18881764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25275 (or 25273 counting only the distinct ones).

The product of its digits is 86016, while the sum is 43.

The square root of 18881764 is about 4345.3151784422. The cubic root of 18881764 is about 266.2855019629.

It can be divided in two parts, 188817 and 64, that added together give a palindrome (188881).

The spelling of 18881764 in words is "eighteen million, eight hundred eighty-one thousand, seven hundred sixty-four".