2505440 has 48 divisors (see below), whose sum is σ = 6767712. Its totient is φ = 858624.

The previous prime is 2505421. The next prime is 2505457. The reversal of 2505440 is 445052.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2 + ... + 2238.

It is an arithmetic number, because the mean of its divisors is an integer number (140994).

2^2505440 is an apocalyptic number.

2505440 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 2505440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3383856).

2505440 is an abundant number, since it is smaller than the sum of its proper divisors (4262272).

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

2505440 is a wasteful number, since it uses less digits than its factorization.

2505440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2251 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 2505440 is about 1582.8581743163. The cubic root of 2505440 is about 135.8192523909.

The spelling of 2505440 in words is "two million, five hundred five thousand, four hundred forty".