1821234 has 8 divisors (see below), whose sum is σ = 3642480. Its totient is φ = 607076.

The previous prime is 1821233. The next prime is 1821257. The reversal of 1821234 is 4321281.

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

1821234 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1821234.

It is not an unprimeable number, because it can be changed into a prime (1821233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151764 + ... + 151775.

It is an arithmetic number, because the mean of its divisors is an integer number (455310).

2^1821234 is an apocalyptic number.

1821234 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1821234 is a wasteful number, since it uses less digits than its factorization.

1821234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303544.

The product of its digits is 384, while the sum is 21.

The square root of 1821234 is about 1349.5310296544. The cubic root of 1821234 is about 122.1205026338.

The spelling of 1821234 in words is "one million, eight hundred twenty-one thousand, two hundred thirty-four".