1155915 has 24 divisors (see below), whose sum is σ = 2122848. Its totient is φ = 579840.

The previous prime is 1155907. The next prime is 1155919. The reversal of 1155915 is 5195511.

It is not a de Polignac number, because 1155915 - 2³ = 1155907 is a prime.

It is a super-3 number, since 3×1155915³ = 4633391026127057625, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

1155915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1155919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10 + ... + 1520.

It is an arithmetic number, because the mean of its divisors is an integer number (88452).

2^1155915 is an apocalyptic number.

1155915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1155915 is a deficient number, since it is larger than the sum of its proper divisors (966933).

1155915 is a wasteful number, since it uses less digits than its factorization.

1155915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1536 counting only the distinct ones).

The product of its digits is 1125, while the sum is 27.

The square root of 1155915 is about 1075.1348752598. The cubic root of 1155915 is about 104.9482738421.

The spelling of 1155915 in words is "one million, one hundred fifty-five thousand, nine hundred fifteen".