1821662 has 8 divisors (see below), whose sum is σ = 2743392. Its totient is φ = 907200.

The previous prime is 1821649. The next prime is 1821679. The reversal of 1821662 is 2661281.

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

It is a congruent 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, 1139 + ... + 2222.

It is an arithmetic number, because the mean of its divisors is an integer number (342924).

2^1821662 is an apocalyptic number.

1821662 is a deficient number, since it is larger than the sum of its proper divisors (921730).

1821662 is a wasteful number, since it uses less digits than its factorization.

1821662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3634.

The product of its digits is 1152, while the sum is 26.

The square root of 1821662 is about 1349.6895939437. The cubic root of 1821662 is about 122.1300682143.

The spelling of 1821662 in words is "one million, eight hundred twenty-one thousand, six hundred sixty-two".