2643887 has 4 divisors (see below), whose sum is σ = 2683416. Its totient is φ = 2604360.

The previous prime is 2643871. The next prime is 2643889. The reversal of 2643887 is 7883462.

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 2643887 - 2⁴ = 2643871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2643887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643889) 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, 19664 + ... + 19797.

It is an arithmetic number, because the mean of its divisors is an integer number (670854).

2^2643887 is an apocalyptic number.

2643887 is a deficient number, since it is larger than the sum of its proper divisors (39529).

2643887 is an equidigital number, since it uses as much as digits as its factorization.

2643887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39528.

The product of its digits is 64512, while the sum is 38.

The square root of 2643887 is about 1626.0033825303. The cubic root of 2643887 is about 138.2762616786.

The spelling of 2643887 in words is "two million, six hundred forty-three thousand, eight hundred eighty-seven".