1155839 has 4 divisors (see below), whose sum is σ = 1158456. Its totient is φ = 1153224.

The previous prime is 1155829. The next prime is 1155841. The reversal of 1155839 is 9385511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1155839 - 2⁴ = 1155823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1155829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (289614).

2^1155839 is an apocalyptic number.

1155839 is a deficient number, since it is larger than the sum of its proper divisors (2617).

1155839 is an equidigital number, since it uses as much as digits as its factorization.

1155839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2616.

The product of its digits is 5400, while the sum is 32.

The square root of 1155839 is about 1075.0995302762. The cubic root of 1155839 is about 104.9459737180.

The spelling of 1155839 in words is "one million, one hundred fifty-five thousand, eight hundred thirty-nine".