1813855 has 8 divisors (see below), whose sum is σ = 2186064. Its totient is φ = 1444800.

The previous prime is 1813853. The next prime is 1813897. The reversal of 1813855 is 5583181.

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

It is not a de Polignac number, because 1813855 - 2¹ = 1813853 is a prime.

It is a super-2 number, since 2×1813855² = 6580139922050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 760 + ... + 2050.

It is an arithmetic number, because the mean of its divisors is an integer number (273258).

2^1813855 is an apocalyptic number.

1813855 is a deficient number, since it is larger than the sum of its proper divisors (372209).

1813855 is a wasteful number, since it uses less digits than its factorization.

1813855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1577.

The product of its digits is 4800, while the sum is 31.

The square root of 1813855 is about 1346.7943421325. The cubic root of 1813855 is about 121.9553496016.

The spelling of 1813855 in words is "one million, eight hundred thirteen thousand, eight hundred fifty-five".