1813263 has 8 divisors (see below), whose sum is σ = 2424576. Its totient is φ = 1205400.

The previous prime is 1813223. The next prime is 1813277. The reversal of 1813263 is 3623181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1813263 - 2¹² = 1809167 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 858 + ... + 2088.

It is an arithmetic number, because the mean of its divisors is an integer number (303072).

2^1813263 is an apocalyptic number.

1813263 is a deficient number, since it is larger than the sum of its proper divisors (611313).

1813263 is a wasteful number, since it uses less digits than its factorization.

1813263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725.

The product of its digits is 864, while the sum is 24.

The square root of 1813263 is about 1346.5745430536. The cubic root of 1813263 is about 121.9420803633.

It can be divided in two parts, 18132 and 63, that multiplied together give a triangular number (1142316 = T₁₅₁₁).

The spelling of 1813263 in words is "one million, eight hundred thirteen thousand, two hundred sixty-three".