19668190 has 8 divisors (see below), whose sum is σ = 35402760. Its totient is φ = 7867272.

The previous prime is 19668179. The next prime is 19668191. The reversal of 19668190 is 9186691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×19668190² = 773675395752200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19668191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983400 + ... + 983419.

It is an arithmetic number, because the mean of its divisors is an integer number (4425345).

Almost surely, 2^19668190 is an apocalyptic number.

19668190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19668190 is a deficient number, since it is larger than the sum of its proper divisors (15734570).

19668190 is a wasteful number, since it uses less digits than its factorization.

19668190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1966826.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 19668190 is about 4434.8833130084. The cubic root of 19668190 is about 269.9322646729.

It can be divided in two parts, 196 and 68190, that added together give a palindrome (68386).

The spelling of 19668190 in words is "nineteen million, six hundred sixty-eight thousand, one hundred ninety".