2556420 has 48 divisors (see below), whose sum is σ = 7233408. Its totient is φ = 674560.

The previous prime is 2556419. The next prime is 2556451. The reversal of 2556420 is 246552.

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, 8065 + ... + 8375.

It is an arithmetic number, because the mean of its divisors is an integer number (150696).

2^2556420 is an apocalyptic number.

2556420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3616704).

2556420 is an abundant number, since it is smaller than the sum of its proper divisors (4676988).

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

2556420 is a wasteful number, since it uses less digits than its factorization.

2556420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2556420 is about 1598.8808586008. The cubic root of 2556420 is about 136.7342781329.

The spelling of 2556420 in words is "two million, five hundred fifty-six thousand, four hundred twenty".