19899409990 has 8 divisors (see below), whose sum is σ = 35818938000. Its totient is φ = 7959763992.

The previous prime is 19899409987. The next prime is 19899409991. The reversal of 19899409990 is 9990499891.

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

It is a super-2 number, since 2×19899409990² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19899409991) 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, 994970490 + ... + 994970509.

It is an arithmetic number, because the mean of its divisors is an integer number (4477367250).

Almost surely, 2^19899409990 is an apocalyptic number.

19899409990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19899409990 is a deficient number, since it is larger than the sum of its proper divisors (15919528010).

19899409990 is a wasteful number, since it uses less digits than its factorization.

19899409990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989941006.

The product of its (nonzero) digits is 17006112, while the sum is 67.

The spelling of 19899409990 in words is "nineteen billion, eight hundred ninety-nine million, four hundred nine thousand, nine hundred ninety".