2620621 has 4 divisors (see below), whose sum is σ = 2663644. Its totient is φ = 2577600.

The previous prime is 2620619. The next prime is 2620633. The reversal of 2620621 is 1260262.

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 171396 + 2449225 = 414^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620621 - 2¹ = 2620619 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620661) 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, 21420 + ... + 21541.

It is an arithmetic number, because the mean of its divisors is an integer number (665911).

2^2620621 is an apocalyptic number.

It is an amenable number.

2620621 is a deficient number, since it is larger than the sum of its proper divisors (43023).

2620621 is an equidigital number, since it uses as much as digits as its factorization.

2620621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43022.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2620621 is about 1618.8332217990. The cubic root of 2620621 is about 137.8694592750.

Adding to 2620621 its reverse (1260262), we get a palindrome (3880883).

The spelling of 2620621 in words is "two million, six hundred twenty thousand, six hundred twenty-one".