523321040 has 80 divisors (see below), whose sum is σ = 1331539776. Its totient is φ = 189696000.

The previous prime is 523321039. The next prime is 523321063. The reversal of 523321040 is 40123325.

It is a happy number.

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 (20).

It is a congruent number.

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, 352139 + ... + 353621.

Almost surely, 2^523321040 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 523321040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (665769888).

523321040 is an abundant number, since it is smaller than the sum of its proper divisors (808218736).

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

523321040 is a wasteful number, since it uses less digits than its factorization.

523321040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 523321040 is about 22876.2112247636. The cubic root of 523321040 is about 805.8534420642.

Adding to 523321040 its reverse (40123325), we get a palindrome (563444365).

The spelling of 523321040 in words is "five hundred twenty-three million, three hundred twenty-one thousand, forty".