875921 has 4 divisors (see below), whose sum is σ = 878592. Its totient is φ = 873252.

The previous prime is 875893. The next prime is 875923. The reversal of 875921 is 129578.

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 a de Polignac number, because none of the positive numbers 2^k-875921 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 875921.

It is not an unprimeable number, because it can be changed into a prime (875923) 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, 761 + ... + 1526.

It is an arithmetic number, because the mean of its divisors is an integer number (219648).

2⁸⁷⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

875921 is a deficient number, since it is larger than the sum of its proper divisors (2671).

875921 is a wasteful number, since it uses less digits than its factorization.

875921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670.

The product of its digits is 5040, while the sum is 32.

The square root of 875921 is about 935.9065124253. The cubic root of 875921 is about 95.6801056498.

The spelling of 875921 in words is "eight hundred seventy-five thousand, nine hundred twenty-one".