19980188 has 12 divisors (see below), whose sum is σ = 36171240. Its totient is φ = 9645552.

The previous prime is 19980187. The next prime is 19980211. The reversal of 19980188 is 88108991.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19980187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86006 + ... + 86237.

It is an arithmetic number, because the mean of its divisors is an integer number (3014270).

Almost surely, 2^19980188 is an apocalyptic number.

It is an amenable number.

19980188 is a deficient number, since it is larger than the sum of its proper divisors (16191052).

19980188 is a wasteful number, since it uses less digits than its factorization.

19980188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172276 (or 172274 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 19980188 is about 4469.9203572323. The cubic root of 19980188 is about 271.3521019776.

The spelling of 19980188 in words is "nineteen million, nine hundred eighty thousand, one hundred eighty-eight".