2387840 has 128 divisors (see below), whose sum is σ = 7197120. Its totient is φ = 737280.

The previous prime is 2387839. The next prime is 2387843. The reversal of 2387840 is 487832.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 2387797 and 2387806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2387843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58220 + ... + 58260.

2^2387840 is an apocalyptic number.

2387840 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 2387840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3598560).

2387840 is an abundant number, since it is smaller than the sum of its proper divisors (4809280).

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

2387840 is a wasteful number, since it uses less digits than its factorization.

2387840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 2387840 is about 1545.2637315358. The cubic root of 2387840 is about 133.6600874728.

The spelling of 2387840 in words is "two million, three hundred eighty-seven thousand, eight hundred forty".