521976 has 64 divisors (see below), whose sum is σ = 1612800. Its totient is φ = 137088.

The previous prime is 521929. The next prime is 521981. The reversal of 521976 is 679125.

521976 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

521976 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2065 + ... + 2303.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2⁵²¹⁹⁷⁶ is an apocalyptic number.

521976 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806400).

521976 is an abundant number, since it is smaller than the sum of its proper divisors (1090824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521976 is a wasteful number, since it uses less digits than its factorization.

521976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 264 counting only the distinct ones).

The product of its digits is 3780, while the sum is 30.

The square root of 521976 is about 722.4790654407. The cubic root of 521976 is about 80.5162448087.

The spelling of 521976 in words is "five hundred twenty-one thousand, nine hundred seventy-six".