245440 has 56 divisors (see below), whose sum is σ = 640080. Its totient is φ = 89088.

The previous prime is 245437. The next prime is 245471. The reversal of 245440 is 44542.

It is an Ulam 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, 4131 + ... + 4189.

It is an arithmetic number, because the mean of its divisors is an integer number (11430).

2²⁴⁵⁴⁴⁰ is an apocalyptic number.

245440 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 245440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (320040).

245440 is an abundant number, since it is smaller than the sum of its proper divisors (394640).

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

245440 is a wasteful number, since it uses less digits than its factorization.

245440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 245440 is about 495.4190145725. The cubic root of 245440 is about 62.6106838696.

Adding to 245440 its reverse (44542), we get a palindrome (289982).

The spelling of 245440 in words is "two hundred forty-five thousand, four hundred forty".