2820989 has 4 divisors (see below), whose sum is σ = 2832480. Its totient is φ = 2809500.

The previous prime is 2820977. The next prime is 2821001. The reversal of 2820989 is 9890282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9890282 = 2 ⋅4945141.

It is an interprime number because it is at equal distance from previous prime (2820977) and next prime (2821001).

It is a cyclic number.

It is not a de Polignac number, because 2820989 - 2⁸ = 2820733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2820919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5369 + ... + 5870.

It is an arithmetic number, because the mean of its divisors is an integer number (708120).

2^2820989 is an apocalyptic number.

It is an amenable number.

2820989 is a deficient number, since it is larger than the sum of its proper divisors (11491).

2820989 is a wasteful number, since it uses less digits than its factorization.

2820989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11490.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 2820989 is about 1679.5800070256. The cubic root of 2820989 is about 141.2972786626.

The spelling of 2820989 in words is "two million, eight hundred twenty thousand, nine hundred eighty-nine".