1813645 has 16 divisors (see below), whose sum is σ = 2427840. Its totient is φ = 1292544.

The previous prime is 1813639. The next prime is 1813667. The reversal of 1813645 is 5463181.

It is not a de Polignac number, because 1813645 - 2⁵ = 1813613 is a prime.

It is a super-3 number, since 3×1813645³ = 17896912035129933375, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1054 + ... + 2176.

It is an arithmetic number, because the mean of its divisors is an integer number (151740).

2^1813645 is an apocalyptic number.

It is an amenable number.

1813645 is a deficient number, since it is larger than the sum of its proper divisors (614195).

1813645 is a wasteful number, since it uses less digits than its factorization.

1813645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its digits is 2880, while the sum is 28.

The square root of 1813645 is about 1346.7163769703. The cubic root of 1813645 is about 121.9506429387.

It can be divided in two parts, 18136 and 45, that added together give a palindrome (18181).

The spelling of 1813645 in words is "one million, eight hundred thirteen thousand, six hundred forty-five".