521439 has 8 divisors (see below), whose sum is σ = 705072. Its totient is φ = 342720.

The previous prime is 521429. The next prime is 521447. The reversal of 521439 is 934125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521439 - 2¹¹ = 519391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521429) 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, 972 + ... + 1409.

It is an arithmetic number, because the mean of its divisors is an integer number (88134).

2⁵²¹⁴³⁹ is an apocalyptic number.

521439 is a deficient number, since it is larger than the sum of its proper divisors (183633).

521439 is a wasteful number, since it uses less digits than its factorization.

521439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2457.

The product of its digits is 1080, while the sum is 24.

The square root of 521439 is about 722.1073327422. The cubic root of 521439 is about 80.4886240885.

Subtracting 521439 from its reverse (934125), we obtain a triangular number (412686 = T₉₀₈).

It can be divided in two parts, 5214 and 39, that added together give a triangular number (5253 = T₁₀₂).

The spelling of 521439 in words is "five hundred twenty-one thousand, four hundred thirty-nine".