18421880 has 32 divisors (see below), whose sum is σ = 43889040. Its totient is φ = 6935040.

The previous prime is 18421867. The next prime is 18421889. The reversal of 18421880 is 8812481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421889) 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, 12866 + ... + 14225.

Almost surely, 2^18421880 is an apocalyptic number.

18421880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18421880 is an abundant number, since it is smaller than the sum of its proper divisors (25467160).

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

18421880 is a wasteful number, since it uses less digits than its factorization.

18421880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27119 (or 27115 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 32.

The square root of 18421880 is about 4292.0717608167. The cubic root of 18421880 is about 264.1058268717.

The spelling of 18421880 in words is "eighteen million, four hundred twenty-one thousand, eight hundred eighty".