1812173 has 4 divisors (see below), whose sum is σ = 1976928. Its totient is φ = 1647420.

The previous prime is 1812157. The next prime is 1812199. The reversal of 1812173 is 3712181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1812173 - 2⁴ = 1812157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812103) 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 3 ways as a sum of consecutive naturals, for example, 82361 + ... + 82382.

It is an arithmetic number, because the mean of its divisors is an integer number (494232).

2^1812173 is an apocalyptic number.

It is an amenable number.

1812173 is a deficient number, since it is larger than the sum of its proper divisors (164755).

1812173 is a wasteful number, since it uses less digits than its factorization.

1812173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164754.

The product of its digits is 336, while the sum is 23.

The square root of 1812173 is about 1346.1697515544. The cubic root of 1812173 is about 121.9176412702.

The spelling of 1812173 in words is "one million, eight hundred twelve thousand, one hundred seventy-three".