523440 has 60 divisors (see below), whose sum is σ = 1760304. Its totient is φ = 139392.

The previous prime is 523433. The next prime is 523459. The reversal of 523440 is 44325.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 357 + ... + 1083.

2⁵²³⁴⁴⁰ 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 523440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (880152).

523440 is an abundant number, since it is smaller than the sum of its proper divisors (1236864).

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

523440 is a wasteful number, since it uses less digits than its factorization.

523440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 523440 is about 723.4915341592. The cubic root of 523440 is about 80.5914498952.

Adding to 523440 its reverse (44325), we get a palindrome (567765).

The spelling of 523440 in words is "five hundred twenty-three thousand, four hundred forty".