1155520 has 56 divisors (see below), whose sum is σ = 2889504. Its totient is φ = 439296.

The previous prime is 1155499. The next prime is 1155527. The reversal of 1155520 is 255511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155527) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7282 + ... + 7438.

2^1155520 is an apocalyptic number.

1155520 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 1155520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444752).

1155520 is an abundant number, since it is smaller than the sum of its proper divisors (1733984).

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

1155520 is a wasteful number, since it uses less digits than its factorization.

1155520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 1155520 is about 1074.9511616813. The cubic root of 1155520 is about 104.9363181501.

Subtracting from 1155520 its reverse (255511), we obtain a palindrome (900009).

The spelling of 1155520 in words is "one million, one hundred fifty-five thousand, five hundred twenty".