1821522 has 8 divisors (see below), whose sum is σ = 3643056. Its totient is φ = 607172.

The previous prime is 1821509. The next prime is 1821541. The reversal of 1821522 is 2251281.

It is a happy number.

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

1821522 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151788 + ... + 151799.

It is an arithmetic number, because the mean of its divisors is an integer number (455382).

2^1821522 is an apocalyptic number.

1821522 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.

1821522 is a wasteful number, since it uses less digits than its factorization.

1821522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303592.

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

The square root of 1821522 is about 1349.6377291703. The cubic root of 1821522 is about 122.1269394510.

The spelling of 1821522 in words is "one million, eight hundred twenty-one thousand, five hundred twenty-two".