521398 has 8 divisors (see below), whose sum is σ = 823320. Its totient is φ = 246960.

The previous prime is 521393. The next prime is 521399. The reversal of 521398 is 893125.

521398 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521393) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6823 + ... + 6898.

It is an arithmetic number, because the mean of its divisors is an integer number (102915).

2⁵²¹³⁹⁸ is an apocalyptic number.

521398 is a deficient number, since it is larger than the sum of its proper divisors (301922).

521398 is a wasteful number, since it uses less digits than its factorization.

521398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13742.

The product of its digits is 2160, while the sum is 28.

The square root of 521398 is about 722.0789430526. The cubic root of 521398 is about 80.4865144649.

It can be divided in two parts, 521 and 398, that added together give a palindrome (919).

The spelling of 521398 in words is "five hundred twenty-one thousand, three hundred ninety-eight".