2560381 has 4 divisors (see below), whose sum is σ = 2648700. Its totient is φ = 2472064.

The previous prime is 2560379. The next prime is 2560399. The reversal of 2560381 is 1830652.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1822500 + 737881 = 1350^2 + 859^2 .

It is a cyclic number.

It is not a de Polignac number, because 2560381 - 2¹ = 2560379 is a prime.

It is a super-2 number, since 2×2560381² = 13111101730322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2560351) 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, 44116 + ... + 44173.

It is an arithmetic number, because the mean of its divisors is an integer number (662175).

2^2560381 is an apocalyptic number.

It is an amenable number.

2560381 is a deficient number, since it is larger than the sum of its proper divisors (88319).

2560381 is an equidigital number, since it uses as much as digits as its factorization.

2560381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88318.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2560381 is about 1600.1190580704. The cubic root of 2560381 is about 136.8048618645.

It can be divided in two parts, 25 and 60381, that added together give a palindrome (60406).

The spelling of 2560381 in words is "two million, five hundred sixty thousand, three hundred eighty-one".