2565420 has 144 divisors (see below), whose sum is σ = 8854272. Its totient is φ = 549120.

The previous prime is 2565403. The next prime is 2565449. The reversal of 2565420 is 245652.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 111529 + ... + 111551.

It is an arithmetic number, because the mean of its divisors is an integer number (61488).

2^2565420 is an apocalyptic number.

2565420 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 2565420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4427136).

2565420 is an abundant number, since it is smaller than the sum of its proper divisors (6288852).

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

2565420 is a wasteful number, since it uses less digits than its factorization.

2565420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72 (or 57 counting only the distinct ones).

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

The square root of 2565420 is about 1601.6928544512. The cubic root of 2565420 is about 136.8945500734.

The spelling of 2565420 in words is "two million, five hundred sixty-five thousand, four hundred twenty".