19980386 has 4 divisors (see below), whose sum is σ = 29970582. Its totient is φ = 9990192.

The previous prime is 19980379. The next prime is 19980397. The reversal of 19980386 is 68308991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68308991 = 2699 ⋅25309.

It can be written as a sum of positive squares in only one way, i.e., 16851025 + 3129361 = 4105^2 + 1769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995095 + ... + 4995098.

Almost surely, 2^19980386 is an apocalyptic number.

19980386 is a deficient number, since it is larger than the sum of its proper divisors (9990196).

19980386 is an equidigital number, since it uses as much as digits as its factorization.

19980386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9990195.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 19980386 is about 4469.9425052231. The cubic root of 19980386 is about 271.3529983245.

The spelling of 19980386 in words is "nineteen million, nine hundred eighty thousand, three hundred eighty-six".