521386 has 8 divisors (see below), whose sum is σ = 789984. Its totient is φ = 258060.

The previous prime is 521377. The next prime is 521393. The reversal of 521386 is 683125.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 521386.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060 + ... + 1471.

It is an arithmetic number, because the mean of its divisors is an integer number (98748).

2⁵²¹³⁸⁶ is an apocalyptic number.

521386 is a deficient number, since it is larger than the sum of its proper divisors (268598).

521386 is a wasteful number, since it uses less digits than its factorization.

521386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636.

The product of its digits is 1440, while the sum is 25.

The square root of 521386 is about 722.0706336640. The cubic root of 521386 is about 80.4858969932.

The spelling of 521386 in words is "five hundred twenty-one thousand, three hundred eighty-six".