19868989 has 8 divisors (see below), whose sum is σ = 22760768. Its totient is φ = 16990560.

The previous prime is 19868977. The next prime is 19869019. The reversal of 19868989 is 98986891.

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

It is a cyclic number.

It is not a de Polignac number, because 19868989 - 2⁵ = 19868957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19868939) 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, 94 + ... + 6304.

It is an arithmetic number, because the mean of its divisors is an integer number (2845096).

Almost surely, 2^19868989 is an apocalyptic number.

It is an amenable number.

19868989 is a deficient number, since it is larger than the sum of its proper divisors (2891779).

19868989 is an equidigital number, since it uses as much as digits as its factorization.

19868989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675.

The product of its digits is 2239488, while the sum is 58.

The square root of 19868989 is about 4457.4644137671. The cubic root of 19868989 is about 270.8477651534.

The spelling of 19868989 in words is "nineteen million, eight hundred sixty-eight thousand, nine hundred eighty-nine".