1865365 has 4 divisors (see below), whose sum is σ = 2238444. Its totient is φ = 1492288.

The previous prime is 1865341. The next prime is 1865371. The reversal of 1865365 is 5635681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1313316 + 552049 = 1146^2 + 743^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865365 - 2⁵ = 1865333 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1865365.

It is a congruent 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, 186532 + ... + 186541.

It is an arithmetic number, because the mean of its divisors is an integer number (559611).

2^1865365 is an apocalyptic number.

It is an amenable number.

1865365 is a deficient number, since it is larger than the sum of its proper divisors (373079).

1865365 is an equidigital number, since it uses as much as digits as its factorization.

1865365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373078.

The product of its digits is 21600, while the sum is 34.

The square root of 1865365 is about 1365.7836578316. The cubic root of 1865365 is about 123.0990235253.

The spelling of 1865365 in words is "one million, eight hundred sixty-five thousand, three hundred sixty-five".