1813955 has 32 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 1169280.

The previous prime is 1813943. The next prime is 1813961. The reversal of 1813955 is 5593181.

It is not a de Polignac number, because 1813955 - 2⁴ = 1813939 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 30716 + ... + 30774.

It is an arithmetic number, because the mean of its divisors is an integer number (83160).

2^1813955 is an apocalyptic number.

1813955 is a deficient number, since it is larger than the sum of its proper divisors (847165).

1813955 is a wasteful number, since it uses less digits than its factorization.

1813955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131.

The product of its digits is 5400, while the sum is 32.

The square root of 1813955 is about 1346.8314668139. The cubic root of 1813955 is about 121.9575907419.

The spelling of 1813955 in words is "one million, eight hundred thirteen thousand, nine hundred fifty-five".