8785921 has 4 divisors (see below), whose sum is σ = 8834644. Its totient is φ = 8737200.

The previous prime is 8785913. The next prime is 8785937. The reversal of 8785921 is 1295878.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112896 + 8673025 = 336^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 8785921 - 2³ = 8785913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8785951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24090 + ... + 24451.

It is an arithmetic number, because the mean of its divisors is an integer number (2208661).

It is a Proth number, since it is equal to 2145 ⋅ 2¹² + 1 and 2145 < 2¹².

Almost surely, 2^8785921 is an apocalyptic number.

It is an amenable number.

8785921 is a deficient number, since it is larger than the sum of its proper divisors (48723).

8785921 is a wasteful number, since it uses less digits than its factorization.

8785921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48722.

The product of its digits is 40320, while the sum is 40.

The square root of 8785921 is about 2964.1054299738. The cubic root of 8785921 is about 206.3458622634.

The spelling of 8785921 in words is "eight million, seven hundred eighty-five thousand, nine hundred twenty-one".