521742 has 16 divisors (see below), whose sum is σ = 1123920. Its totient is φ = 160512.

The previous prime is 521723. The next prime is 521743. The reversal of 521742 is 247125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3267 + ... + 3422.

It is an arithmetic number, because the mean of its divisors is an integer number (70245).

2⁵²¹⁷⁴² is an apocalyptic number.

521742 is an abundant number, since it is smaller than the sum of its proper divisors (602178).

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

521742 is a wasteful number, since it uses less digits than its factorization.

521742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6707.

The product of its digits is 560, while the sum is 21.

The square root of 521742 is about 722.3171048785. The cubic root of 521742 is about 80.5042112942.

Adding to 521742 its reverse (247125), we get a palindrome (768867).

The spelling of 521742 in words is "five hundred twenty-one thousand, seven hundred forty-two".