1155439 has 4 divisors (see below), whose sum is σ = 1223424. Its totient is φ = 1087456.

The previous prime is 1155437. The next prime is 1155449. The reversal of 1155439 is 9345511.

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

It is not a de Polignac number, because 1155439 - 2¹ = 1155437 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 (1155431) 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 3 ways as a sum of consecutive naturals, for example, 33967 + ... + 34000.

It is an arithmetic number, because the mean of its divisors is an integer number (305856).

2^1155439 is an apocalyptic number.

1155439 is a deficient number, since it is larger than the sum of its proper divisors (67985).

1155439 is an equidigital number, since it uses as much as digits as its factorization.

1155439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67984.

The product of its digits is 2700, while the sum is 28.

The square root of 1155439 is about 1074.9134848908. The cubic root of 1155439 is about 104.9338661399.

The spelling of 1155439 in words is "one million, one hundred fifty-five thousand, four hundred thirty-nine".