19990190 has 16 divisors (see below), whose sum is σ = 39253680. Its totient is φ = 7269120.

The previous prime is 19990177. The next prime is 19990213. The reversal of 19990190 is 9109991.

It is a happy number.

It is a super-2 number, since 2×19990190² = 799215392472200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90755 + ... + 90974.

It is an arithmetic number, because the mean of its divisors is an integer number (2453355).

Almost surely, 2^19990190 is an apocalyptic number.

19990190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19990190 is a deficient number, since it is larger than the sum of its proper divisors (19263490).

19990190 is a wasteful number, since it uses less digits than its factorization.

19990190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181747.

The product of its (nonzero) digits is 6561, while the sum is 38.

The square root of 19990190 is about 4471.0390291296. The cubic root of 19990190 is about 271.3973736732.

It can be divided in two parts, 199901 and 90, that added together give a palindrome (199991).

The spelling of 19990190 in words is "nineteen million, nine hundred ninety thousand, one hundred ninety".