1855863 has 12 divisors (see below), whose sum is σ = 2822040. Its totient is φ = 1172016.

The previous prime is 1855853. The next prime is 1855891. The reversal of 1855863 is 3685581.

It is not a de Polignac number, because 1855863 - 2¹⁴ = 1839479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1855813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5256 + ... + 5597.

It is an arithmetic number, because the mean of its divisors is an integer number (235170).

2^1855863 is an apocalyptic number.

1855863 is a deficient number, since it is larger than the sum of its proper divisors (966177).

1855863 is a wasteful number, since it uses less digits than its factorization.

1855863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10878 (or 10875 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 1855863 is about 1362.3006276149. The cubic root of 1855863 is about 122.8896491929.

The spelling of 1855863 in words is "one million, eight hundred fifty-five thousand, eight hundred sixty-three".