8721977 has 4 divisors (see below), whose sum is σ = 9514896. Its totient is φ = 7929060.

The previous prime is 8721941. The next prime is 8721989. The reversal of 8721977 is 7791278.

8721977 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8721977 - 2⁶ = 8721913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8721907) 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, 396443 + ... + 396464.

It is an arithmetic number, because the mean of its divisors is an integer number (2378724).

Almost surely, 2^8721977 is an apocalyptic number.

It is an amenable number.

8721977 is a deficient number, since it is larger than the sum of its proper divisors (792919).

8721977 is a wasteful number, since it uses less digits than its factorization.

8721977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792918.

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

The square root of 8721977 is about 2953.2993414146. The cubic root of 8721977 is about 205.8440472968.

The spelling of 8721977 in words is "eight million, seven hundred twenty-one thousand, nine hundred seventy-seven".