503440 has 80 divisors (see below), whose sum is σ = 1428480. Its totient is φ = 161280.

The previous prime is 503431. The next prime is 503441. The reversal of 503440 is 44305.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (503441) 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, 16225 + ... + 16255.

It is an arithmetic number, because the mean of its divisors is an integer number (17856).

2⁵⁰³⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 503440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714240).

503440 is an abundant number, since it is smaller than the sum of its proper divisors (925040).

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

503440 is a wasteful number, since it uses less digits than its factorization.

503440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 503440 is about 709.5350590351. The cubic root of 503440 is about 79.5516587369.

Adding to 503440 its reverse (44305), we get a palindrome (547745).

The spelling of 503440 in words is "five hundred three thousand, four hundred forty".