8777921 has 4 divisors (see below), whose sum is σ = 8784432. Its totient is φ = 8771412.

The previous prime is 8777911. The next prime is 8777947. The reversal of 8777921 is 1297778.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1297778 = 2 ⋅648889.

It is a cyclic number.

It is not a de Polignac number, because 8777921 - 2¹⁰ = 8776897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8777911) 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, 395 + ... + 4208.

It is an arithmetic number, because the mean of its divisors is an integer number (2196108).

Almost surely, 2^8777921 is an apocalyptic number.

It is an amenable number.

8777921 is a deficient number, since it is larger than the sum of its proper divisors (6511).

8777921 is a wasteful number, since it uses less digits than its factorization.

8777921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6510.

The product of its digits is 49392, while the sum is 41.

The square root of 8777921 is about 2962.7556429783. The cubic root of 8777921 is about 206.2832139960.

The spelling of 8777921 in words is "eight million, seven hundred seventy-seven thousand, nine hundred twenty-one".