1821422 has 4 divisors (see below), whose sum is σ = 2732136. Its totient is φ = 910710.

The previous prime is 1821409. The next prime is 1821427. The reversal of 1821422 is 2241281.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 1821394 and 1821403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455354 + ... + 455357.

It is an arithmetic number, because the mean of its divisors is an integer number (683034).

2^1821422 is an apocalyptic number.

1821422 is a deficient number, since it is larger than the sum of its proper divisors (910714).

1821422 is an equidigital number, since it uses as much as digits as its factorization.

1821422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910713.

The product of its digits is 256, while the sum is 20.

The square root of 1821422 is about 1349.6006816833. The cubic root of 1821422 is about 122.1247045220.

The spelling of 1821422 in words is "one million, eight hundred twenty-one thousand, four hundred twenty-two".