1813884 has 12 divisors (see below), whose sum is σ = 4232424. Its totient is φ = 604624.

The previous prime is 1813853. The next prime is 1813897. The reversal of 1813884 is 4883181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75567 + ... + 75590.

It is an arithmetic number, because the mean of its divisors is an integer number (352702).

2^1813884 is an apocalyptic number.

It is an amenable number.

1813884 is an abundant number, since it is smaller than the sum of its proper divisors (2418540).

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

1813884 is a wasteful number, since it uses less digits than its factorization.

1813884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151164 (or 151162 counting only the distinct ones).

The product of its digits is 6144, while the sum is 33.

The square root of 1813884 is about 1346.8051083954. The cubic root of 1813884 is about 121.9559995408.

The spelling of 1813884 in words is "one million, eight hundred thirteen thousand, eight hundred eighty-four".