1099491840 has 160 divisors (see below), whose sum is σ = 3905732160. Its totient is φ = 293179392.

The previous prime is 1099491803. The next prime is 1099491851. The reversal of 1099491840 is 481949901.

It is a tau number, because it is divible by the number of its divisors (160).

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61167 + ... + 77073.

It is an arithmetic number, because the mean of its divisors is an integer number (24410826).

Almost surely, 2^1099491840 is an apocalyptic number.

1099491840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1099491840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1952866080).

1099491840 is an abundant number, since it is smaller than the sum of its proper divisors (2806240320).

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

1099491840 is an equidigital number, since it uses as much as digits as its factorization.

1099491840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15939 (or 15917 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 1099491840 is about 33158.5862183538. The cubic root of 1099491840 is about 1032.1211323471.

It can be divided in two parts, 109 and 9491840, that added together give a palindrome (9491949).

The spelling of 1099491840 in words is "one billion, ninety-nine million, four hundred ninety-one thousand, eight hundred forty".