1861863 has 16 divisors (see below), whose sum is σ = 2578560. Its totient is φ = 1194336.

The previous prime is 1861861. The next prime is 1861879. The reversal of 1861863 is 3681681.

It is not a de Polignac number, because 1861863 - 2¹ = 1861861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11781 + ... + 11937.

It is an arithmetic number, because the mean of its divisors is an integer number (161160).

2^1861863 is an apocalyptic number.

1861863 is a deficient number, since it is larger than the sum of its proper divisors (716697).

1861863 is a wasteful number, since it uses less digits than its factorization.

1861863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its digits is 6912, while the sum is 33.

The square root of 1861863 is about 1364.5010076948. The cubic root of 1861863 is about 123.0219406957.

It can be divided in two parts, 18618 and 63, that added together give a palindrome (18681).

The spelling of 1861863 in words is "one million, eight hundred sixty-one thousand, eight hundred sixty-three".