3620021 has 2 divisors, whose sum is σ = 3620022. Its totient is φ = 3620020.

The previous prime is 3620011. The next prime is 3620033. The reversal of 3620021 is 1200263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2146225 + 1473796 = 1465^2 + 1214^2 .

It is a cyclic number.

It is not a de Polignac number, because 3620021 - 2¹⁸ = 3357877 is a prime.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 3619978 and 3620005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3620011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810010 + 1810011.

It is an arithmetic number, because the mean of its divisors is an integer number (1810011).

Almost surely, 2^3620021 is an apocalyptic number.

It is an amenable number.

3620021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3620021 is an equidigital number, since it uses as much as digits as its factorization.

3620021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 3620021 is about 1902.6352777135. The cubic root of 3620021 is about 153.5454777237.

Adding to 3620021 its reverse (1200263), we get a palindrome (4820284).

The spelling of 3620021 in words is "three million, six hundred twenty thousand, twenty-one".