1800859 has 2 divisors, whose sum is σ = 1800860. Its totient is φ = 1800858.

The previous prime is 1800853. The next prime is 1800863. The reversal of 1800859 is 9580081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1800859 - 2⁷ = 1800731 is a prime.

1800859 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1800859.

It is not a weakly prime, because it can be changed into another prime (1800853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900429 + 900430.

It is an arithmetic number, because the mean of its divisors is an integer number (900430).

2^1800859 is an apocalyptic number.

1800859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800859 is an equidigital number, since it uses as much as digits as its factorization.

1800859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 1800859 is about 1341.9608787144. The cubic root of 1800859 is about 121.6633872472.

The spelling of 1800859 in words is "one million, eight hundred thousand, eight hundred fifty-nine".