1622021 has 4 divisors (see below), whose sum is σ = 1717452. Its totient is φ = 1526592.

The previous prime is 1622009. The next prime is 1622039. The reversal of 1622021 is 1202261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 792100 + 829921 = 890^2 + 911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1622021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1621987 and 1622005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1622041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47690 + ... + 47723.

It is an arithmetic number, because the mean of its divisors is an integer number (429363).

2^1622021 is an apocalyptic number.

It is an amenable number.

1622021 is a deficient number, since it is larger than the sum of its proper divisors (95431).

1622021 is an equidigital number, since it uses as much as digits as its factorization.

1622021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95430.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1622021 is about 1273.5858824594. The cubic root of 1622021 is about 117.4948481218.

Adding to 1622021 its reverse (1202261), we get a palindrome (2824282).

The spelling of 1622021 in words is "one million, six hundred twenty-two thousand, twenty-one".