8779406921 has 16 divisors (see below), whose sum is σ = 9007504128. Its totient is φ = 8554896000.

The previous prime is 8779406897. The next prime is 8779406927. The reversal of 8779406921 is 1296049778.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8779406921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8779406927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2353760 + ... + 2357486.

It is an arithmetic number, because the mean of its divisors is an integer number (562969008).

Almost surely, 2^8779406921 is an apocalyptic number.

It is an amenable number.

8779406921 is a deficient number, since it is larger than the sum of its proper divisors (228097207).

8779406921 is a wasteful number, since it uses less digits than its factorization.

8779406921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4192.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The square root of 8779406921 is about 93698.4894275249. The cubic root of 8779406921 is about 2062.9485317057.

The spelling of 8779406921 in words is "eight billion, seven hundred seventy-nine million, four hundred six thousand, nine hundred twenty-one".