1145665 has 4 divisors (see below), whose sum is σ = 1374804. Its totient is φ = 916528.

The previous prime is 1145659. The next prime is 1145689. The reversal of 1145665 is 5665411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5665411 = 29 ⋅195359.

It can be written as a sum of positive squares in 2 ways, for example, as 341056 + 804609 = 584^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 1145665 - 2⁷ = 1145537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114562 + ... + 114571.

It is an arithmetic number, because the mean of its divisors is an integer number (343701).

2^1145665 is an apocalyptic number.

It is an amenable number.

1145665 is a deficient number, since it is larger than the sum of its proper divisors (229139).

1145665 is an equidigital number, since it uses as much as digits as its factorization.

1145665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229138.

The product of its digits is 3600, while the sum is 28.

The square root of 1145665 is about 1070.3574169407. The cubic root of 1145665 is about 104.6371450858.

The spelling of 1145665 in words is "one million, one hundred forty-five thousand, six hundred sixty-five".