1999791090 has 192 divisors, whose sum is σ = 6201142272. Its totient is φ = 441446400.

The previous prime is 1999791089. The next prime is 1999791103. The reversal of 1999791090 is 901979991.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 519814 + ... + 523646.

It is an arithmetic number, because the mean of its divisors is an integer number (32297616).

Almost surely, 2^1999791090 is an apocalyptic number.

1999791090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999791090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3100571136).

1999791090 is an abundant number, since it is smaller than the sum of its proper divisors (4201351182).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999791090 is a wasteful number, since it uses less digits than its factorization.

1999791090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3905 (or 3902 counting only the distinct ones).

The product of its (nonzero) digits is 413343, while the sum is 54.

The square root of 1999791090 is about 44719.0238041932. The cubic root of 1999791090 is about 1259.8771800163.

The spelling of 1999791090 in words is "one billion, nine hundred ninety-nine million, seven hundred ninety-one thousand, ninety".