1865321 has 2 divisors, whose sum is σ = 1865322. Its totient is φ = 1865320.

The previous prime is 1865299. The next prime is 1865327. The reversal of 1865321 is 1235681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125721 + 739600 = 1061^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865321 - 2¹⁰ = 1864297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1865327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932660 + 932661.

It is an arithmetic number, because the mean of its divisors is an integer number (932661).

2^1865321 is an apocalyptic number.

It is an amenable number.

1865321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865321 is an equidigital number, since it uses as much as digits as its factorization.

1865321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 1865321 is about 1365.7675497683. The cubic root of 1865321 is about 123.0980556361.

The spelling of 1865321 in words is "one million, eight hundred sixty-five thousand, three hundred twenty-one".