1099240 has 16 divisors (see below), whose sum is σ = 2473380. Its totient is φ = 439680.

The previous prime is 1099223. The next prime is 1099247. The reversal of 1099240 is 429901.

It can be written as a sum of positive squares in 2 ways, for example, as 1044484 + 54756 = 1022^2 + 234^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1099247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13701 + ... + 13780.

2^1099240 is an apocalyptic number.

1099240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1099240 is an abundant number, since it is smaller than the sum of its proper divisors (1374140).

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

1099240 is a wasteful number, since it uses less digits than its factorization.

1099240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27492 (or 27488 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1099240 is about 1048.4464697828. The cubic root of 1099240 is about 103.2042323445.

The spelling of 1099240 in words is "one million, ninety-nine thousand, two hundred forty".