1812201 has 8 divisors (see below), whose sum is σ = 2543520. Its totient is φ = 1144512.

The previous prime is 1812199. The next prime is 1812227. The reversal of 1812201 is 1022181.

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

It is not a de Polignac number, because 1812201 - 2¹ = 1812199 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1812271) 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 7 ways as a sum of consecutive naturals, for example, 15840 + ... + 15953.

It is an arithmetic number, because the mean of its divisors is an integer number (317940).

2^1812201 is an apocalyptic number.

It is an amenable number.

1812201 is a deficient number, since it is larger than the sum of its proper divisors (731319).

1812201 is a wasteful number, since it uses less digits than its factorization.

1812201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31815.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 1812201 is about 1346.1801513913. The cubic root of 1812201 is about 121.9182691860.

Adding to 1812201 its reverse (1022181), we get a palindrome (2834382).

The spelling of 1812201 in words is "one million, eight hundred twelve thousand, two hundred one".