1157989 has 16 divisors (see below), whose sum is σ = 1444608. Its totient is φ = 905472.

The previous prime is 1157987. The next prime is 1158007. The reversal of 1157989 is 9897511.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1157989 - 2¹ = 1157987 is a prime.

It is a Duffinian number.

Its product of digits (22680) is a multiple of the sum of its prime divisors (324).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157987) 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 15 ways as a sum of consecutive naturals, for example, 4272 + ... + 4534.

It is an arithmetic number, because the mean of its divisors is an integer number (90288).

2^1157989 is an apocalyptic number.

It is an amenable number.

1157989 is a deficient number, since it is larger than the sum of its proper divisors (286619).

1157989 is a wasteful number, since it uses less digits than its factorization.

1157989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324.

The product of its digits is 22680, while the sum is 40.

The square root of 1157989 is about 1076.0989731433. The cubic root of 1157989 is about 105.0110041377.

The spelling of 1157989 in words is "one million, one hundred fifty-seven thousand, nine hundred eighty-nine".