1155389 has 4 divisors (see below), whose sum is σ = 1195260. Its totient is φ = 1115520.

The previous prime is 1155379. The next prime is 1155403. The reversal of 1155389 is 9835511.

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

It can be written as a sum of positive squares in 2 ways, for example, as 466489 + 688900 = 683^2 + 830^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155389 - 2⁴ = 1155373 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 (1155379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19892 + ... + 19949.

It is an arithmetic number, because the mean of its divisors is an integer number (298815).

2^1155389 is an apocalyptic number.

It is an amenable number.

1155389 is a deficient number, since it is larger than the sum of its proper divisors (39871).

1155389 is an equidigital number, since it uses as much as digits as its factorization.

1155389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39870.

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

The square root of 1155389 is about 1074.8902269534. The cubic root of 1155389 is about 104.9323524962.

The spelling of 1155389 in words is "one million, one hundred fifty-five thousand, three hundred eighty-nine".