2551860 has 36 divisors (see below), whose sum is σ = 7741188. Its totient is φ = 680448.

The previous prime is 2551859. The next prime is 2551867. The reversal of 2551860 is 681552.

It can be written as a sum of positive squares in 2 ways, for example, as 1971216 + 580644 = 1404^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6909 + ... + 7268.

It is an arithmetic number, because the mean of its divisors is an integer number (215033).

2^2551860 is an apocalyptic number.

2551860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551860 is an abundant number, since it is smaller than the sum of its proper divisors (5189328).

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

2551860 is a wasteful number, since it uses less digits than its factorization.

2551860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14192 (or 14187 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2551860 is about 1597.4542246963. The cubic root of 2551860 is about 136.6529300755.

The spelling of 2551860 in words is "two million, five hundred fifty-one thousand, eight hundred sixty".