521446 has 4 divisors (see below), whose sum is σ = 782172. Its totient is φ = 260722.

The previous prime is 521429. The next prime is 521447. The reversal of 521446 is 644125.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521447) by changing a digit.

521446 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 as a sum of consecutive naturals, namely, 130360 + ... + 130363.

It is an arithmetic number, because the mean of its divisors is an integer number (195543).

2⁵²¹⁴⁴⁶ is an apocalyptic number.

521446 is a deficient number, since it is larger than the sum of its proper divisors (260726).

521446 is a wasteful number, since it uses less digits than its factorization.

521446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260725.

The product of its digits is 960, while the sum is 22.

The square root of 521446 is about 722.1121796508. The cubic root of 521446 is about 80.4889842571.

The spelling of 521446 in words is "five hundred twenty-one thousand, four hundred forty-six".