1851859 has 2 divisors, whose sum is σ = 1851860. Its totient is φ = 1851858.

The previous prime is 1851851. The next prime is 1851869. The reversal of 1851859 is 9581581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1851859 - 2³ = 1851851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1851851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925929 + 925930.

It is an arithmetic number, because the mean of its divisors is an integer number (925930).

2^1851859 is an apocalyptic number.

1851859 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851859 is an equidigital number, since it uses as much as digits as its factorization.

1851859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 37.

The square root of 1851859 is about 1360.8302612743. The cubic root of 1851859 is about 122.8012079585.

The spelling of 1851859 in words is "one million, eight hundred fifty-one thousand, eight hundred fifty-nine".