2025640 has 32 divisors (see below), whose sum is σ = 4617000. Its totient is φ = 799744.

The previous prime is 2025637. The next prime is 2025641. The reversal of 2025640 is 465202.

It can be written as a sum of positive squares in 4 ways, for example, as 956484 + 1069156 = 978^2 + 1034^2 .

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (2025641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3276 + ... + 3844.

2^2025640 is an apocalyptic number.

2025640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

2025640 is the 712-nd decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2025640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308500).

2025640 is an abundant number, since it is smaller than the sum of its proper divisors (2591360).

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

2025640 is a wasteful number, since it uses less digits than its factorization.

2025640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669 (or 665 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2025640 is about 1423.2498023889. The cubic root of 2025640 is about 126.5282267100.

The spelling of 2025640 in words is "two million, twenty-five thousand, six hundred forty".