2820621 has 8 divisors (see below), whose sum is σ = 3862624. Its totient is φ = 1829520.

The previous prime is 2820619. The next prime is 2820641. The reversal of 2820621 is 1260282.

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

It is not a de Polignac number, because 2820621 - 2¹ = 2820619 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

2820621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820641) 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, 12595 + ... + 12816.

It is an arithmetic number, because the mean of its divisors is an integer number (482828).

2^2820621 is an apocalyptic number.

It is an amenable number.

2820621 is a deficient number, since it is larger than the sum of its proper divisors (1042003).

2820621 is a wasteful number, since it uses less digits than its factorization.

2820621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25451.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 2820621 is about 1679.4704522557. The cubic root of 2820621 is about 141.2911342856.

The spelling of 2820621 in words is "two million, eight hundred twenty thousand, six hundred twenty-one".