2563887 has 4 divisors (see below), whose sum is σ = 3418520. Its totient is φ = 1709256.

The previous prime is 2563877. The next prime is 2563901. The reversal of 2563887 is 7883652.

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

It is not a de Polignac number, because 2563887 - 2¹⁸ = 2301743 is a prime.

It is a D-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 (2563837) 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, 427312 + ... + 427317.

It is an arithmetic number, because the mean of its divisors is an integer number (854630).

2^2563887 is an apocalyptic number.

2563887 is a deficient number, since it is larger than the sum of its proper divisors (854633).

2563887 is an equidigital number, since it uses as much as digits as its factorization.

2563887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854632.

The product of its digits is 80640, while the sum is 39.

The square root of 2563887 is about 1601.2142267667. The cubic root of 2563887 is about 136.8672769354.

The spelling of 2563887 in words is "two million, five hundred sixty-three thousand, eight hundred eighty-seven".