19890292990 has 16 divisors (see below), whose sum is σ = 36409350960. Its totient is φ = 7821267520.

The previous prime is 19890292957. The next prime is 19890292993. The reversal of 19890292990 is 9929209891.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19890292993) 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, 16855591 + ... + 16856770.

It is an arithmetic number, because the mean of its divisors is an integer number (2275584435).

Almost surely, 2^19890292990 is an apocalyptic number.

19890292990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19890292990 is a deficient number, since it is larger than the sum of its proper divisors (16519057970).

19890292990 is a wasteful number, since it uses less digits than its factorization.

19890292990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33712427.

The product of its (nonzero) digits is 1889568, while the sum is 58.

The spelling of 19890292990 in words is "nineteen billion, eight hundred ninety million, two hundred ninety-two thousand, nine hundred ninety".