8376721 has 2 divisors, whose sum is σ = 8376722. Its totient is φ = 8376720.

The previous prime is 8376691. The next prime is 8376749. The reversal of 8376721 is 1276738.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4456321 + 3920400 = 2111^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 8376721 - 2¹⁷ = 8245649 is a prime.

It is not a weakly prime, because it can be changed into another prime (8376791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4188360 + 4188361.

It is an arithmetic number, because the mean of its divisors is an integer number (4188361).

Almost surely, 2^8376721 is an apocalyptic number.

It is an amenable number.

8376721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8376721 is an equidigital number, since it uses as much as digits as its factorization.

8376721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 34.

The square root of 8376721 is about 2894.2565539357. The cubic root of 8376721 is about 203.0913143666.

The spelling of 8376721 in words is "eight million, three hundred seventy-six thousand, seven hundred twenty-one".