2399840 has 48 divisors (see below), whose sum is σ = 5797008. Its totient is φ = 938496.

The previous prime is 2399821. The next prime is 2399869. The reversal of 2399840 is 489932.

It is a self number, because there is not a number n which added to its sum of digits gives 2399840.

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, 8339 + ... + 8621.

It is an arithmetic number, because the mean of its divisors is an integer number (120771).

2^2399840 is an apocalyptic number.

2399840 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 2399840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2898504).

2399840 is an abundant number, since it is smaller than the sum of its proper divisors (3397168).

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

2399840 is a wasteful number, since it uses less digits than its factorization.

2399840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 2399840 is about 1549.1416978443. The cubic root of 2399840 is about 133.8836146928.

The spelling of 2399840 in words is "two million, three hundred ninety-nine thousand, eight hundred forty".