2638871 has 4 divisors (see below), whose sum is σ = 2648544. Its totient is φ = 2629200.

The previous prime is 2638849. The next prime is 2638873. The reversal of 2638871 is 1788362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1788362 = 2 ⋅894181.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2638871 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4415 + ... + 4976.

It is an arithmetic number, because the mean of its divisors is an integer number (662136).

2^2638871 is an apocalyptic number.

2638871 is a deficient number, since it is larger than the sum of its proper divisors (9673).

2638871 is an equidigital number, since it uses as much as digits as its factorization.

2638871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9672.

The product of its digits is 16128, while the sum is 35.

The square root of 2638871 is about 1624.4602180417. The cubic root of 2638871 is about 138.1887601046.

The spelling of 2638871 in words is "two million, six hundred thirty-eight thousand, eight hundred seventy-one".