8380921 has 2 divisors, whose sum is σ = 8380922. Its totient is φ = 8380920.

The previous prime is 8380903. The next prime is 8380927. The reversal of 8380921 is 1290838.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6451600 + 1929321 = 2540^2 + 1389^2 .

It is a cyclic number.

It is not a de Polignac number, because 8380921 - 2¹¹ = 8378873 is a prime.

It is equal to p₅₆₃₆₈₃ and since 8380921 and 563683 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (8380927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4190460 + 4190461.

It is an arithmetic number, because the mean of its divisors is an integer number (4190461).

Almost surely, 2^8380921 is an apocalyptic number.

It is an amenable number.

8380921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8380921 is an equidigital number, since it uses as much as digits as its factorization.

8380921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 8380921 is about 2894.9820379408. The cubic root of 8380921 is about 203.1252513133.

The spelling of 8380921 in words is "eight million, three hundred eighty thousand, nine hundred twenty-one".