1816263 has 20 divisors (see below), whose sum is σ = 2874960. Its totient is φ = 1138752.

The previous prime is 1816261. The next prime is 1816271. The reversal of 1816263 is 3626181.

It is not a de Polignac number, because 1816263 - 2¹ = 1816261 is a prime.

It is a super-2 number, since 2×1816263² = 6597622570338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

1816263 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816261) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 718 + ... + 2036.

It is an arithmetic number, because the mean of its divisors is an integer number (143748).

2^1816263 is an apocalyptic number.

1816263 is a deficient number, since it is larger than the sum of its proper divisors (1058697).

1816263 is a wasteful number, since it uses less digits than its factorization.

1816263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1348 (or 1339 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1816263 is about 1347.6880202777. The cubic root of 1816263 is about 122.0092933886.

It can be divided in two parts, 18162 and 63, that added together give a square (18225 = 135²).

The spelling of 1816263 in words is "one million, eight hundred sixteen thousand, two hundred sixty-three".