1813638 has 8 divisors (see below), whose sum is σ = 3627288. Its totient is φ = 604544.

The previous prime is 1813627. The next prime is 1813639. The reversal of 1813638 is 8363181.

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

1813638 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151131 + ... + 151142.

It is an arithmetic number, because the mean of its divisors is an integer number (453411).

2^1813638 is an apocalyptic number.

1813638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1813638 is a wasteful number, since it uses less digits than its factorization.

1813638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302278.

The product of its digits is 3456, while the sum is 30.

The square root of 1813638 is about 1346.7137780538. The cubic root of 1813638 is about 121.9504860437.

The spelling of 1813638 in words is "one million, eight hundred thirteen thousand, six hundred thirty-eight".