109491690 has 192 divisors, whose sum is σ = 343203840. Its totient is φ = 21859200.

The previous prime is 109491673. The next prime is 109491703. The reversal of 109491690 is 96194901.

It is a super-2 number, since 2×109491690² = 23976860358112200, which contains 22 as substring.

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, 787641 + ... + 787779.

It is an arithmetic number, because the mean of its divisors is an integer number (1787520).

Almost surely, 2^109491690 is an apocalyptic number.

109491690 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 109491690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171601920).

109491690 is an abundant number, since it is smaller than the sum of its proper divisors (233712150).

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

109491690 is a wasteful number, since it uses less digits than its factorization.

109491690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 109491690 is about 10463.8276935355. The cubic root of 109491690 is about 478.4028075817.

The spelling of 109491690 in words is "one hundred nine million, four hundred ninety-one thousand, six hundred ninety".