523212540 has 36 divisors (see below), whose sum is σ = 1465491384. Its totient is φ = 139476096.

The previous prime is 523212517. The next prime is 523212583. The reversal of 523212540 is 45212325.

It is a self number, because there is not a number n which added to its sum of digits gives 523212540.

It is a congruent number.

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, 175704 + ... + 178656.

It is an arithmetic number, because the mean of its divisors is an integer number (40708094).

Almost surely, 2^523212540 is an apocalyptic number.

It is an amenable number.

523212540 is an abundant number, since it is smaller than the sum of its proper divisors (942278844).

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

523212540 is an equidigital number, since it uses as much as digits as its factorization.

523212540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918 (or 2963 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 523212540 is about 22873.8396427010. The cubic root of 523212540 is about 805.7977457611.

Adding to 523212540 its reverse (45212325), we get a palindrome (568424865).

The spelling of 523212540 in words is "five hundred twenty-three million, two hundred twelve thousand, five hundred forty".