2505856 has 16 divisors (see below), whose sum is σ = 4992390. Its totient is φ = 1252864.

The previous prime is 2505847. The next prime is 2505857. The reversal of 2505856 is 6585052.

It can be written as a sum of positive squares in only one way, i.e., 1537600 + 968256 = 1240^2 + 984^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

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 as a sum of consecutive naturals, namely, 9661 + ... + 9916.

2^2505856 is an apocalyptic number.

It is an amenable number.

2505856 is a deficient number, since it is larger than the sum of its proper divisors (2486534).

2505856 is an equidigital number, since it uses as much as digits as its factorization.

2505856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591 (or 19579 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 2505856 is about 1582.9895767187. The cubic root of 2505856 is about 135.8267690590.

The spelling of 2505856 in words is "two million, five hundred five thousand, eight hundred fifty-six".