2864639 has 4 divisors (see below), whose sum is σ = 2870424. Its totient is φ = 2858856.

The previous prime is 2864633. The next prime is 2864647. The reversal of 2864639 is 9364682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2864639 - 2⁴ = 2864623 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 (2864633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2072 + ... + 3165.

It is an arithmetic number, because the mean of its divisors is an integer number (717606).

2^2864639 is an apocalyptic number.

2864639 is a deficient number, since it is larger than the sum of its proper divisors (5785).

2864639 is an equidigital number, since it uses as much as digits as its factorization.

2864639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784.

The product of its digits is 62208, while the sum is 38.

The square root of 2864639 is about 1692.5244459091. The cubic root of 2864639 is about 142.0223300200.

The spelling of 2864639 in words is "two million, eight hundred sixty-four thousand, six hundred thirty-nine".