876521 has 4 divisors (see below), whose sum is σ = 883344. Its totient is φ = 869700.

The previous prime is 876497. The next prime is 876523. The reversal of 876521 is 125678.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 876521 - 2¹⁸ = 614377 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (876523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3215 + ... + 3476.

It is an arithmetic number, because the mean of its divisors is an integer number (220836).

2⁸⁷⁶⁵²¹ is an apocalyptic number.

It is an amenable number.

876521 is a deficient number, since it is larger than the sum of its proper divisors (6823).

876521 is a wasteful number, since it uses less digits than its factorization.

876521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

The product of its digits is 3360, while the sum is 29.

The square root of 876521 is about 936.2270023878. The cubic root of 876521 is about 95.7019474066.

The spelling of 876521 in words is "eight hundred seventy-six thousand, five hundred twenty-one".