1089724440 has 128 divisors (see below), whose sum is σ = 3760450560. Its totient is φ = 247463424.

The previous prime is 1089724439. The next prime is 1089724477. The reversal of 1089724440 is 444279801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127749 + ... + 136011.

It is an arithmetic number, because the mean of its divisors is an integer number (29378520).

Almost surely, 2^1089724440 is an apocalyptic number.

1089724440 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 1089724440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1880225280).

1089724440 is an abundant number, since it is smaller than the sum of its proper divisors (2670726120).

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

1089724440 is a wasteful number, since it uses less digits than its factorization.

1089724440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441 (or 8437 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 1089724440 is about 33010.9745387803. The cubic root of 1089724440 is about 1029.0557343393.

The spelling of 1089724440 in words is "one billion, eighty-nine million, seven hundred twenty-four thousand, four hundred forty".