2445840 has 120 divisors (see below), whose sum is σ = 8511360. Its totient is φ = 628992.

The previous prime is 2445829. The next prime is 2445847. The reversal of 2445840 is 485442.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2445847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30921 + ... + 30999.

It is an arithmetic number, because the mean of its divisors is an integer number (70928).

2^2445840 is an apocalyptic number.

2445840 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 2445840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4255680).

2445840 is an abundant number, since it is smaller than the sum of its proper divisors (6065520).

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

2445840 is a wasteful number, since it uses less digits than its factorization.

2445840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

The square root of 2445840 is about 1563.9181564264. The cubic root of 2445840 is about 134.7336311512.

It can be divided in two parts, 244 and 5840, that added together give a square (6084 = 78²).

The spelling of 2445840 in words is "two million, four hundred forty-five thousand, eight hundred forty".