1155120 has 40 divisors (see below), whose sum is σ = 3581616. Its totient is φ = 307968.

The previous prime is 1155107. The next prime is 1155127. The reversal of 1155120 is 215511.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1155120.

It is not an unprimeable number, because it can be changed into a prime (1155127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2167 + ... + 2646.

2^1155120 is an apocalyptic number.

1155120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1155120 is an abundant number, since it is smaller than the sum of its proper divisors (2426496).

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

1155120 is a wasteful number, since it uses less digits than its factorization.

1155120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4829 (or 4823 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 1155120 is about 1074.7650906128. The cubic root of 1155120 is about 104.9242083434.

It can be divided in two parts, 1155 and 120, that added together give a triangular number (1275 = T₅₀).

The spelling of 1155120 in words is "one million, one hundred fifty-five thousand, one hundred twenty".