1155800 has 24 divisors (see below), whose sum is σ = 2687700. Its totient is φ = 462240.

The previous prime is 1155733. The next prime is 1155821. The reversal of 1155800 is 85511.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2690 + ... + 3089.

2^1155800 is an apocalyptic number.

1155800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155800 is an abundant number, since it is smaller than the sum of its proper divisors (1531900).

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

1155800 is a wasteful number, since it uses less digits than its factorization.

1155800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5795 (or 5786 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1155800 is about 1075.0813922676. The cubic root of 1155800 is about 104.9447933521.

The spelling of 1155800 in words is "one million, one hundred fifty-five thousand, eight hundred".