2780489 has 4 divisors (see below), whose sum is σ = 2799300. Its totient is φ = 2761680.

The previous prime is 2780467. The next prime is 2780501. The reversal of 2780489 is 9840872.

2780489 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.

It can be written as a sum of positive squares in 2 ways, for example, as 284089 + 2496400 = 533^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780489 - 2⁸ = 2780233 is a prime.

It is a super-2 number, since 2×2780489² = 15462238158242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2780419) 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, 9182 + ... + 9479.

It is an arithmetic number, because the mean of its divisors is an integer number (699825).

2^2780489 is an apocalyptic number.

It is an amenable number.

2780489 is a deficient number, since it is larger than the sum of its proper divisors (18811).

2780489 is a wasteful number, since it uses less digits than its factorization.

2780489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18810.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 2780489 is about 1667.4798349605. The cubic root of 2780489 is about 140.6178306798.

The spelling of 2780489 in words is "two million, seven hundred eighty thousand, four hundred eighty-nine".