1812231 has 6 divisors (see below), whose sum is σ = 2617680. Its totient is φ = 1208148.

The previous prime is 1812227. The next prime is 1812233. The reversal of 1812231 is 1322181.

It is not a de Polignac number, because 1812231 - 2² = 1812227 is a prime.

It is a super-2 number, since 2×1812231² = 6568362394722, which contains 22 as substring.

1812231 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1812233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100671 + ... + 100688.

It is an arithmetic number, because the mean of its divisors is an integer number (436280).

2^1812231 is an apocalyptic number.

1812231 is a deficient number, since it is larger than the sum of its proper divisors (805449).

1812231 is a wasteful number, since it uses less digits than its factorization.

1812231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201365 (or 201362 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

The square root of 1812231 is about 1346.1912939846. The cubic root of 1812231 is about 121.9189419458.

The spelling of 1812231 in words is "one million, eight hundred twelve thousand, two hundred thirty-one".