2381640 has 64 divisors (see below), whose sum is σ = 7257600. Its totient is φ = 625152.

The previous prime is 2381633. The next prime is 2381651. The reversal of 2381640 is 461832.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2381640.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10569 + ... + 10791.

It is an arithmetic number, because the mean of its divisors is an integer number (113400).

2^2381640 is an apocalyptic number.

2381640 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 2381640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3628800).

2381640 is an abundant number, since it is smaller than the sum of its proper divisors (4875960).

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

2381640 is a wasteful number, since it uses less digits than its factorization.

2381640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 322 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 2381640 is about 1543.2562975734. The cubic root of 2381640 is about 133.5443048953.

2381640 divided by its sum of digits (24) gives a triangular number (99235 = T₄₄₅).

The spelling of 2381640 in words is "two million, three hundred eighty-one thousand, six hundred forty".