521712 has 30 divisors (see below), whose sum is σ = 1460472. Its totient is φ = 173856.

The previous prime is 521707. The next prime is 521723. The reversal of 521712 is 217125.

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

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1668 + ... + 1955.

2⁵²¹⁷¹² is an apocalyptic number.

It is an amenable number.

521712 is an abundant number, since it is smaller than the sum of its proper divisors (938760).

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

521712 is a wasteful number, since it uses less digits than its factorization.

521712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637 (or 3628 counting only the distinct ones).

The product of its digits is 140, while the sum is 18.

The square root of 521712 is about 722.2963380774. The cubic root of 521712 is about 80.5026682757.

Adding to 521712 its reverse (217125), we get a palindrome (738837).

It can be divided in two parts, 52 and 1712, that added together give a square (1764 = 42²).

The spelling of 521712 in words is "five hundred twenty-one thousand, seven hundred twelve".