1822621 has 8 divisors (see below), whose sum is σ = 1996920. Its totient is φ = 1655808.

The previous prime is 1822571. The next prime is 1822633. The reversal of 1822621 is 1262281.

It can be written as a sum of positive squares in 4 ways, for example, as 171396 + 1651225 = 414^2 + 1285^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1822621 - 2⁷ = 1822493 is a prime.

It is a Duffinian number.

1822621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1822592 and 1822601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1822661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1356 + ... + 2341.

It is an arithmetic number, because the mean of its divisors is an integer number (249615).

2^1822621 is an apocalyptic number.

It is an amenable number.

1822621 is a deficient number, since it is larger than the sum of its proper divisors (174299).

1822621 is a wasteful number, since it uses less digits than its factorization.

1822621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743.

The product of its digits is 384, while the sum is 22.

The square root of 1822621 is about 1350.0448140710. The cubic root of 1822621 is about 122.1514959341.

The spelling of 1822621 in words is "one million, eight hundred twenty-two thousand, six hundred twenty-one".