1155995 has 8 divisors (see below), whose sum is σ = 1421280. Its totient is φ = 902080.

The previous prime is 1155977. The next prime is 1155997. The reversal of 1155995 is 5995511.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1155995 - 2¹⁰ = 1154971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1155997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2615 + ... + 3024.

It is an arithmetic number, because the mean of its divisors is an integer number (177660).

2^1155995 is an apocalyptic number.

1155995 is a deficient number, since it is larger than the sum of its proper divisors (265285).

1155995 is an equidigital number, since it uses as much as digits as its factorization.

1155995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5685.

The product of its digits is 10125, while the sum is 35.

The square root of 1155995 is about 1075.1720792506. The cubic root of 1155995 is about 104.9506949163.

Subtracting from 1155995 its sum of digits (35), we obtain a triangular number (1155960 = T₁₅₂₀).

The spelling of 1155995 in words is "one million, one hundred fifty-five thousand, nine hundred ninety-five".