1099980 has 120 divisors (see below), whose sum is σ = 3984288. Its totient is φ = 248832.

The previous prime is 1099961. The next prime is 1099997. The reversal of 1099980 is 899901.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11292 + ... + 11388.

2^1099980 is an apocalyptic number.

1099980 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 1099980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1992144).

1099980 is an abundant number, since it is smaller than the sum of its proper divisors (2884308).

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

1099980 is a wasteful number, since it uses less digits than its factorization.

1099980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 1099980 is about 1048.7993135009. The cubic root of 1099980 is about 103.2273859175.

The spelling of 1099980 in words is "one million, ninety-nine thousand, nine hundred eighty".