1801863 has 24 divisors (see below), whose sum is σ = 3058848. Its totient is φ = 1000512.

The previous prime is 1801853. The next prime is 1801867. The reversal of 1801863 is 3681081.

It is not a de Polignac number, because 1801863 - 2¹⁸ = 1539719 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1801867) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1945 + ... + 2717.

It is an arithmetic number, because the mean of its divisors is an integer number (127452).

2^1801863 is an apocalyptic number.

1801863 is a deficient number, since it is larger than the sum of its proper divisors (1256985).

1801863 is a wasteful number, since it uses less digits than its factorization.

1801863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1801863 is about 1342.3349060499. The cubic root of 1801863 is about 121.6859926349.

It can be divided in two parts, 18018 and 63, that added together give a palindrome (18081).

The spelling of 1801863 in words is "one million, eight hundred one thousand, eight hundred sixty-three".