1155000 has 160 divisors (see below), whose sum is σ = 4498560. Its totient is φ = 240000.

The previous prime is 1154987. The next prime is 1155001. The reversal of 1155000 is 5511.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155001) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 104995 + ... + 105005.

It is an arithmetic number, because the mean of its divisors is an integer number (28116).

2^1155000 is an apocalyptic number.

1155000 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 1155000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2249280).

1155000 is an abundant number, since it is smaller than the sum of its proper divisors (3343560).

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

1155000 is a wasteful number, since it uses less digits than its factorization.

1155000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 25, while the sum is 12.

The square root of 1155000 is about 1074.7092630102. The cubic root of 1155000 is about 104.9205748562.

It can be divided in two parts, 115 and 5000, that added together give a palindrome (5115).

The spelling of 1155000 in words is "one million, one hundred fifty-five thousand".