1813845 has 16 divisors (see below), whose sum is σ = 3166272. Its totient is φ = 879360.

The previous prime is 1813843. The next prime is 1813853. The reversal of 1813845 is 5483181.

It is not a de Polignac number, because 1813845 - 2¹ = 1813843 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813843) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5332 + ... + 5661.

It is an arithmetic number, because the mean of its divisors is an integer number (197892).

2^1813845 is an apocalyptic number.

1813845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1813845 is a deficient number, since it is larger than the sum of its proper divisors (1352427).

1813845 is a wasteful number, since it uses less digits than its factorization.

1813845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11012.

The product of its digits is 3840, while the sum is 30.

The square root of 1813845 is about 1346.7906296080. The cubic root of 1813845 is about 121.9551254830.

The spelling of 1813845 in words is "one million, eight hundred thirteen thousand, eight hundred forty-five".