1143865 has 4 divisors (see below), whose sum is σ = 1372644. Its totient is φ = 915088.

The previous prime is 1143851. The next prime is 1143887. The reversal of 1143865 is 5683411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5683411 = 59 ⋅96329.

It can be written as a sum of positive squares in 2 ways, for example, as 881721 + 262144 = 939^2 + 512^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143865 is a prime.

It is a Duffinian number.

1143865 is a lucky 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, 114382 + ... + 114391.

It is an arithmetic number, because the mean of its divisors is an integer number (343161).

2^1143865 is an apocalyptic number.

It is an amenable number.

1143865 is a deficient number, since it is larger than the sum of its proper divisors (228779).

1143865 is an equidigital number, since it uses as much as digits as its factorization.

1143865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228778.

The product of its digits is 2880, while the sum is 28.

The square root of 1143865 is about 1069.5162457859. The cubic root of 1143865 is about 104.5823164966.

The spelling of 1143865 in words is "one million, one hundred forty-three thousand, eight hundred sixty-five".