1812863 has 12 divisors (see below), whose sum is σ = 2081808. Its totient is φ = 1572480.

The previous prime is 1812851. The next prime is 1812869. The reversal of 1812863 is 3682181.

It is not a de Polignac number, because 1812863 - 2¹² = 1808767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812869) 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, 2558 + ... + 3188.

It is an arithmetic number, because the mean of its divisors is an integer number (173484).

2^1812863 is an apocalyptic number.

1812863 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1812863 is a deficient number, since it is larger than the sum of its proper divisors (268945).

1812863 is a wasteful number, since it uses less digits than its factorization.

1812863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674 (or 661 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The square root of 1812863 is about 1346.4260098498. The cubic root of 1812863 is about 121.9331130266.

The spelling of 1812863 in words is "one million, eight hundred twelve thousand, eight hundred sixty-three".