1821726 has 12 divisors (see below), whose sum is σ = 3947112. Its totient is φ = 607236.

The previous prime is 1821713. The next prime is 1821731. The reversal of 1821726 is 6271281.

It is a self number, because there is not a number n which added to its sum of digits gives 1821726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50586 + ... + 50621.

It is an arithmetic number, because the mean of its divisors is an integer number (328926).

2^1821726 is an apocalyptic number.

1821726 is an abundant number, since it is smaller than the sum of its proper divisors (2125386).

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

1821726 is a wasteful number, since it uses less digits than its factorization.

1821726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101215 (or 101212 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1821726 is about 1349.7133028907. The cubic root of 1821726 is about 122.1314984527.

The spelling of 1821726 in words is "one million, eight hundred twenty-one thousand, seven hundred twenty-six".