1099280 has 80 divisors (see below), whose sum is σ = 3166464. Its totient is φ = 345600.

The previous prime is 1099279. The next prime is 1099289. The reversal of 1099280 is 829901.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (1099289) 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, 7205 + ... + 7355.

2^1099280 is an apocalyptic number.

1099280 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 1099280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1583232).

1099280 is an abundant number, since it is smaller than the sum of its proper divisors (2067184).

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

1099280 is a wasteful number, since it uses less digits than its factorization.

1099280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1099280 is about 1048.4655454520. The cubic root of 1099280 is about 103.2054841546.

It can be divided in two parts, 1099 and 280, that multiplied together give a triangular number (307720 = T₇₈₄).

The spelling of 1099280 in words is "one million, ninety-nine thousand, two hundred eighty".