1145989 has 6 divisors (see below), whose sum is σ = 1241106. Its totient is φ = 1057680.

The previous prime is 1145983. The next prime is 1145999. The reversal of 1145989 is 9895411.

It can be written as a sum of positive squares in 3 ways, for example, as 1089 + 1144900 = 33^2 + 1070^2 .

It is not a de Polignac number, because 1145989 - 2¹⁵ = 1113221 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 (1145983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3222 + ... + 3559.

It is an arithmetic number, because the mean of its divisors is an integer number (206851).

2^1145989 is an apocalyptic number.

It is an amenable number.

1145989 is a deficient number, since it is larger than the sum of its proper divisors (95117).

1145989 is an equidigital number, since it uses as much as digits as its factorization.

1145989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6807 (or 6794 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 1145989 is about 1070.5087575541. The cubic root of 1145989 is about 104.6470081317.

The spelling of 1145989 in words is "one million, one hundred forty-five thousand, nine hundred eighty-nine".