521986 has 8 divisors (see below), whose sum is σ = 786240. Its totient is φ = 259908.

The previous prime is 521981. The next prime is 521993. The reversal of 521986 is 689125.

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

It is not an unprimeable number, because it can be changed into a prime (521981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355 + ... + 1081.

It is an arithmetic number, because the mean of its divisors is an integer number (98280).

2⁵²¹⁹⁸⁶ is an apocalyptic number.

521986 is a deficient number, since it is larger than the sum of its proper divisors (264254).

521986 is a wasteful number, since it uses less digits than its factorization.

521986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088.

The product of its digits is 4320, while the sum is 31.

The square root of 521986 is about 722.4859860233. The cubic root of 521986 is about 80.5167589814.

The spelling of 521986 in words is "five hundred twenty-one thousand, nine hundred eighty-six".