19868986 has 4 divisors (see below), whose sum is σ = 29803482. Its totient is φ = 9934492.

The previous prime is 19868977. The next prime is 19869019. The reversal of 19868986 is 68986891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19633761 + 235225 = 4431^2 + 485^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4967245 + ... + 4967248.

Almost surely, 2^19868986 is an apocalyptic number.

19868986 is a deficient number, since it is larger than the sum of its proper divisors (9934496).

19868986 is an equidigital number, since it uses as much as digits as its factorization.

19868986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9934495.

The product of its digits is 1492992, while the sum is 55.

The square root of 19868986 is about 4457.4640772529. The cubic root of 19868986 is about 270.8477515217.

The spelling of 19868986 in words is "nineteen million, eight hundred sixty-eight thousand, nine hundred eighty-six".