19984986 has 24 divisors (see below), whose sum is σ = 49486944. Its totient is φ = 5709960.

The previous prime is 19984969. The next prime is 19985023. The reversal of 19984986 is 68948991.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79180 + ... + 79431.

It is an arithmetic number, because the mean of its divisors is an integer number (2061956).

Almost surely, 2^19984986 is an apocalyptic number.

19984986 is an abundant number, since it is smaller than the sum of its proper divisors (29501958).

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

19984986 is a wasteful number, since it uses less digits than its factorization.

19984986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158626 (or 158623 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 54.

The square root of 19984986 is about 4470.4570236163. The cubic root of 19984986 is about 271.3738208788.

The spelling of 19984986 in words is "nineteen million, nine hundred eighty-four thousand, nine hundred eighty-six".