1155880 has 64 divisors (see below), whose sum is σ = 2954880. Its totient is φ = 403200.

The previous prime is 1155863. The next prime is 1155899. The reversal of 1155880 is 885511.

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, 16245 + ... + 16315.

It is an arithmetic number, because the mean of its divisors is an integer number (46170).

2^1155880 is an apocalyptic number.

1155880 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 1155880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477440).

1155880 is an abundant number, since it is smaller than the sum of its proper divisors (1799000).

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

1155880 is a wasteful number, since it uses less digits than its factorization.

1155880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130 (or 126 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 28.

The square root of 1155880 is about 1075.1185981091. The cubic root of 1155880 is about 104.9472145869.

It can be divided in two parts, 115 and 5880, that added together give a palindrome (5995).

The spelling of 1155880 in words is "one million, one hundred fifty-five thousand, eight hundred eighty".