1153865 has 4 divisors (see below), whose sum is σ = 1384644. Its totient is φ = 923088.

The previous prime is 1153853. The next prime is 1153871. The reversal of 1153865 is 5683511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5683511 = 167 ⋅34033.

It can be written as a sum of positive squares in 2 ways, for example, as 292681 + 861184 = 541^2 + 928^2 .

It is a cyclic number.

It is not a de Polignac number, because 1153865 - 2⁴ = 1153849 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, 115382 + ... + 115391.

It is an arithmetic number, because the mean of its divisors is an integer number (346161).

2^1153865 is an apocalyptic number.

It is an amenable number.

1153865 is a deficient number, since it is larger than the sum of its proper divisors (230779).

1153865 is an equidigital number, since it uses as much as digits as its factorization.

1153865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230778.

The product of its digits is 3600, while the sum is 29.

The square root of 1153865 is about 1074.1810834305. The cubic root of 1153865 is about 104.8861956697.

The spelling of 1153865 in words is "one million, one hundred fifty-three thousand, eight hundred sixty-five".