19989190 has 16 divisors (see below), whose sum is σ = 38748528. Its totient is φ = 7380576.

The previous prime is 19989163. The next prime is 19989191. The reversal of 19989190 is 9198991.

It is a super-2 number, since 2×19989190² = 799135433712200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19989190.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989191) 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, 76752 + ... + 77011.

It is an arithmetic number, because the mean of its divisors is an integer number (2421783).

Almost surely, 2^19989190 is an apocalyptic number.

19989190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19989190 is a deficient number, since it is larger than the sum of its proper divisors (18759338).

19989190 is a wasteful number, since it uses less digits than its factorization.

19989190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153783.

The product of its (nonzero) digits is 52488, while the sum is 46.

The square root of 19989190 is about 4470.9271969022. The cubic root of 19989190 is about 271.3928480884.

The spelling of 19989190 in words is "nineteen million, nine hundred eighty-nine thousand, one hundred ninety".