109791990 has 128 divisors (see below), whose sum is σ = 365091840. Its totient is φ = 22809600.

The previous prime is 109791971. The next prime is 109792021. The reversal of 109791990 is 99197901.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18150 + ... + 23430.

It is an arithmetic number, because the mean of its divisors is an integer number (2852280).

Almost surely, 2^109791990 is an apocalyptic number.

109791990 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 109791990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182545920).

109791990 is an abundant number, since it is smaller than the sum of its proper divisors (255299850).

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

109791990 is a wasteful number, since it uses less digits than its factorization.

109791990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315 (or 5309 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 109791990 is about 10478.1673015848. The cubic root of 109791990 is about 478.8397759683.

The spelling of 109791990 in words is "one hundred nine million, seven hundred ninety-one thousand, nine hundred ninety".