1089440 has 48 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 395520.

The previous prime is 1089427. The next prime is 1089457. The reversal of 1089440 is 449801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 2069.

It is an arithmetic number, because the mean of its divisors is an integer number (58590).

2^1089440 is an apocalyptic number.

1089440 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 1089440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1406160).

1089440 is an abundant number, since it is smaller than the sum of its proper divisors (1722880).

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

1089440 is a wasteful number, since it uses less digits than its factorization.

1089440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1089440 is about 1043.7624250757. The cubic root of 1089440 is about 102.8966191799.

The spelling of 1089440 in words is "one million, eighty-nine thousand, four hundred forty".