1099680 has 96 divisors (see below), whose sum is σ = 3628800. Its totient is φ = 279552.

The previous prime is 1099669. The next prime is 1099687. The reversal of 1099680 is 869901.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1099680² = 2418592204800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1099687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13881 + ... + 13959.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2^1099680 is an apocalyptic number.

1099680 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 1099680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1814400).

1099680 is an abundant number, since it is smaller than the sum of its proper divisors (2529120).

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

1099680 is a wasteful number, since it uses less digits than its factorization.

1099680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 1099680 is about 1048.6562830594. The cubic root of 1099680 is about 103.2180005858.

The spelling of 1099680 in words is "one million, ninety-nine thousand, six hundred eighty".