1089749040 has 80 divisors (see below), whose sum is σ = 3389970528. Its totient is φ = 289589248.

The previous prime is 1089749033. The next prime is 1089749069. The reversal of 1089749040 is 409479801.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1089748983 and 1089749001.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62572 + ... + 78068.

Almost surely, 2^1089749040 is an apocalyptic number.

1089749040 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 1089749040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1694985264).

1089749040 is an abundant number, since it is smaller than the sum of its proper divisors (2300221488).

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

1089749040 is a wasteful number, since it uses less digits than its factorization.

1089749040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15806 (or 15800 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 1089749040 is about 33011.3471400366. The cubic root of 1089749040 is about 1029.0634777588.

The spelling of 1089749040 in words is "one billion, eighty-nine million, seven hundred forty-nine thousand, forty".