1815222 has 16 divisors (see below), whose sum is σ = 3821760. Its totient is φ = 573192.

The previous prime is 1815221. The next prime is 1815223. The reversal of 1815222 is 2225181.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1815221) and next prime (1815223).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1815221) 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, 7848 + ... + 8075.

It is an arithmetic number, because the mean of its divisors is an integer number (238860).

2^1815222 is an apocalyptic number.

1815222 is an abundant number, since it is smaller than the sum of its proper divisors (2006538).

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

1815222 is a wasteful number, since it uses less digits than its factorization.

1815222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15947.

The product of its digits is 320, while the sum is 21.

The square root of 1815222 is about 1347.3017479392. The cubic root of 1815222 is about 121.9859788598.

The spelling of 1815222 in words is "one million, eight hundred fifteen thousand, two hundred twenty-two".