244640 has 48 divisors (see below), whose sum is σ = 635040. Its totient is φ = 88320.

The previous prime is 244639. The next prime is 244667. The reversal of 244640 is 46442.

244640 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

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, 1691 + ... + 1829.

It is an arithmetic number, because the mean of its divisors is an integer number (13230).

2²⁴⁴⁶⁴⁰ is an apocalyptic number.

244640 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 244640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (317520).

244640 is an abundant number, since it is smaller than the sum of its proper divisors (390400).

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

244640 is a wasteful number, since it uses less digits than its factorization.

244640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 244640 is about 494.6109582288. The cubic root of 244640 is about 62.5425843120.

It can be divided in two parts, 24 and 4640, that added together give a palindrome (4664).

The spelling of 244640 in words is "two hundred forty-four thousand, six hundred forty".