1089240 has 64 divisors (see below), whose sum is σ = 3391200. Its totient is φ = 279552.

The previous prime is 1089239. The next prime is 1089259. The reversal of 1089240 is 429801.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1089240.

It is a congruent number.

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, 3324 + ... + 3636.

2^1089240 is an apocalyptic number.

1089240 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 1089240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1695600).

1089240 is an abundant number, since it is smaller than the sum of its proper divisors (2301960).

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

1089240 is a wasteful number, since it uses less digits than its factorization.

1089240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1089240 is about 1043.6666134355. Note that the first 4 decimals coincide. The cubic root of 1089240 is about 102.8903221884.

The spelling of 1089240 in words is "one million, eighty-nine thousand, two hundred forty".