1109281904 has 80 divisors (see below), whose sum is σ = 2319547968. Its totient is φ = 512557056.

The previous prime is 1109281903. The next prime is 1109281907. The reversal of 1109281904 is 4091829011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109281903) 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, 3499154 + ... + 3499470.

Almost surely, 2^1109281904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1109281904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1159773984).

1109281904 is an abundant number, since it is smaller than the sum of its proper divisors (1210266064).

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

1109281904 is a wasteful number, since it uses less digits than its factorization.

1109281904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1109281904 is about 33305.8839246161. The cubic root of 1109281904 is about 1035.1754792823.

The spelling of 1109281904 in words is "one billion, one hundred nine million, two hundred eighty-one thousand, nine hundred four".