1109123240 has 16 divisors (see below), whose sum is σ = 2495527380. Its totient is φ = 443649280.

The previous prime is 1109123221. The next prime is 1109123243. The reversal of 1109123240 is 423219011.

It can be written as a sum of positive squares in 2 ways, for example, as 1095477604 + 13645636 = 33098^2 + 3694^2 .

It is not an unprimeable number, because it can be changed into a prime (1109123243) 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, 13864001 + ... + 13864080.

Almost surely, 2^1109123240 is an apocalyptic number.

1109123240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1109123240 is an abundant number, since it is smaller than the sum of its proper divisors (1386404140).

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

1109123240 is a wasteful number, since it uses less digits than its factorization.

1109123240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27728092 (or 27728088 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1109123240 is about 33303.5019179665. The cubic root of 1109123240 is about 1035.1261221522.

The spelling of 1109123240 in words is "one billion, one hundred nine million, one hundred twenty-three thousand, two hundred forty".