19989910 has 8 divisors (see below), whose sum is σ = 35981856. Its totient is φ = 7995960.

The previous prime is 19989887. The next prime is 19989911. The reversal of 19989910 is 1998991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19989911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999486 + ... + 999505.

It is an arithmetic number, because the mean of its divisors is an integer number (4497732).

Almost surely, 2^19989910 is an apocalyptic number.

19989910 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19989910 is a deficient number, since it is larger than the sum of its proper divisors (15991946).

19989910 is a wasteful number, since it uses less digits than its factorization.

19989910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998998.

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

The square root of 19989910 is about 4471.0077163879. The cubic root of 19989910 is about 271.3961065247.

It can be divided in two parts, 199 and 89910, that added together give a palindrome (90109).

The spelling of 19989910 in words is "nineteen million, nine hundred eighty-nine thousand, nine hundred ten".