2505855 has 16 divisors (see below), whose sum is σ = 4374144. Its totient is φ = 1214880.

The previous prime is 2505847. The next prime is 2505857. The reversal of 2505855 is 5585052.

It is not a de Polignac number, because 2505855 - 2³ = 2505847 is a prime.

2505855 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7429 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (273384).

2^2505855 is an apocalyptic number.

2505855 is a deficient number, since it is larger than the sum of its proper divisors (1868289).

2505855 is a wasteful number, since it uses less digits than its factorization.

2505855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15206.

The product of its (nonzero) digits is 10000, while the sum is 30.

The square root of 2505855 is about 1582.9892608606. The cubic root of 2505855 is about 135.8267509910.

It can be divided in two parts, 250 and 5855, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 2505855 in words is "two million, five hundred five thousand, eight hundred fifty-five".