2555820 has 48 divisors (see below), whose sum is σ = 7953120. Its totient is φ = 681408.

The previous prime is 2555809. The next prime is 2555837. The reversal of 2555820 is 285552.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1827 + ... + 2906.

It is an arithmetic number, because the mean of its divisors is an integer number (165690).

2^2555820 is an apocalyptic number.

2555820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2555820 is an abundant number, since it is smaller than the sum of its proper divisors (5397300).

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

2555820 is a wasteful number, since it uses less digits than its factorization.

2555820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4751 (or 4743 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 2555820 is about 1598.6932163489. The cubic root of 2555820 is about 136.7235799709.

It can be divided in two parts, 2555 and 820, that added together give a cube (3375 = 15³).

The spelling of 2555820 in words is "two million, five hundred fifty-five thousand, eight hundred twenty".