1089720 has 64 divisors (see below), whose sum is σ = 3636000. Its totient is φ = 290304.

The previous prime is 1089713. The next prime is 1089757. The reversal of 1089720 is 279801.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 576 + ... + 1584.

2^1089720 is an apocalyptic number.

1089720 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 1089720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1818000).

1089720 is an abundant number, since it is smaller than the sum of its proper divisors (2546280).

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

1089720 is a wasteful number, since it uses less digits than its factorization.

1089720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1089720 is about 1043.8965465984. The cubic root of 1089720 is about 102.9054336734.

The spelling of 1089720 in words is "one million, eighty-nine thousand, seven hundred twenty".