2555540 has 24 divisors (see below), whose sum is σ = 5780040. Its totient is φ = 943488.

The previous prime is 2555521. The next prime is 2555543. The reversal of 2555540 is 455552.

It can be written as a sum of positive squares in 4 ways, for example, as 329476 + 2226064 = 574^2 + 1492^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4655 + ... + 5174.

It is an arithmetic number, because the mean of its divisors is an integer number (240835).

2^2555540 is an apocalyptic number.

2555540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2555540 is an abundant number, since it is smaller than the sum of its proper divisors (3224500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2555540 is a wasteful number, since it uses less digits than its factorization.

2555540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9851 (or 9849 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 26.

The square root of 2555540 is about 1598.6056424272. The cubic root of 2555540 is about 136.7185869223.

The spelling of 2555540 in words is "two million, five hundred fifty-five thousand, five hundred forty".