2789981 has 4 divisors (see below), whose sum is σ = 2799264. Its totient is φ = 2780700.

The previous prime is 2789951. The next prime is 2789993. The reversal of 2789981 is 1899872.

2789981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 2789981 - 2¹⁴ = 2773597 is a prime.

It is a super-2 number, since 2×2789981² = 15567987960722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2789951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4175 + ... + 4796.

It is an arithmetic number, because the mean of its divisors is an integer number (699816).

2^2789981 is an apocalyptic number.

It is an amenable number.

2789981 is a deficient number, since it is larger than the sum of its proper divisors (9283).

2789981 is an equidigital number, since it uses as much as digits as its factorization.

2789981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9282.

The product of its digits is 72576, while the sum is 44.

The square root of 2789981 is about 1670.3236213381. The cubic root of 2789981 is about 140.7776620953. Note that the first 3 decimals are identical.

The spelling of 2789981 in words is "two million, seven hundred eighty-nine thousand, nine hundred eighty-one".