1091520 has 84 divisors (see below), whose sum is σ = 3764280. Its totient is φ = 290304.

The previous prime is 1091509. The next prime is 1091521. The reversal of 1091520 is 251901.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1091493 and 1091502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2691 + ... + 3069.

2^1091520 is an apocalyptic number.

1091520 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 1091520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882140).

1091520 is an abundant number, since it is smaller than the sum of its proper divisors (2672760).

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

1091520 is a wasteful number, since it uses less digits than its factorization.

1091520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 389 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1091520 is about 1044.7583452646. The cubic root of 1091520 is about 102.9620622528.

The spelling of 1091520 in words is "one million, ninety-one thousand, five hundred twenty".