2638887 has 4 divisors (see below), whose sum is σ = 3518520. Its totient is φ = 1759256.

The previous prime is 2638879. The next prime is 2638897. The reversal of 2638887 is 7888362.

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 2638887 - 2³ = 2638879 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2638897) 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, 439812 + ... + 439817.

It is an arithmetic number, because the mean of its divisors is an integer number (879630).

2^2638887 is an apocalyptic number.

2638887 is a deficient number, since it is larger than the sum of its proper divisors (879633).

2638887 is an equidigital number, since it uses as much as digits as its factorization.

2638887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879632.

The product of its digits is 129024, while the sum is 42.

The square root of 2638887 is about 1624.4651427470. The cubic root of 2638887 is about 138.1890393927.

The spelling of 2638887 in words is "two million, six hundred thirty-eight thousand, eight hundred eighty-seven".