1109287872 has 420 divisors, whose sum is σ = 4183389144. Its totient is φ = 287400960.

The previous prime is 1109287871. The next prime is 1109287873. The reversal of 1109287872 is 2787829011.

It is an interprime number because it is at equal distance from previous prime (1109287871) and next prime (1109287873).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109287871) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2793978 + ... + 2794374.

Almost surely, 2^1109287872 is an apocalyptic number.

1109287872 is a gapful number since it is divisible by the number (12) 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 1109287872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2091694572).

1109287872 is an abundant number, since it is smaller than the sum of its proper divisors (3074101272).

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

1109287872 is a wasteful number, since it uses less digits than its factorization.

1109287872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 1109287872 is about 33305.9735182745. The cubic root of 1109287872 is about 1035.1773357133.

The spelling of 1109287872 in words is "one billion, one hundred nine million, two hundred eighty-seven thousand, eight hundred seventy-two".