19980186 has 16 divisors (see below), whose sum is σ = 40055904. Its totient is φ = 6644144.

The previous prime is 19980179. The next prime is 19980187. The reversal of 19980186 is 68108991.

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 7 ways as a sum of consecutive naturals, for example, 1101 + ... + 6416.

It is an arithmetic number, because the mean of its divisors is an integer number (2503494).

Almost surely, 2^19980186 is an apocalyptic number.

19980186 is an abundant number, since it is smaller than the sum of its proper divisors (20075718).

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

19980186 is a wasteful number, since it uses less digits than its factorization.

19980186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7965.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 19980186 is about 4469.9201335147. The cubic root of 19980186 is about 271.3520929236.

The spelling of 19980186 in words is "nineteen million, nine hundred eighty thousand, one hundred eighty-six".