8380621 has 2 divisors, whose sum is σ = 8380622. Its totient is φ = 8380620.

The previous prime is 8380597. The next prime is 8380649. The reversal of 8380621 is 1260838.

It is an a-pointer prime, because the next prime (8380649) can be obtained adding 8380621 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8037225 + 343396 = 2835^2 + 586^2 .

It is a cyclic number.

It is not a de Polignac number, because 8380621 - 2⁹ = 8380109 is a prime.

It is equal to p₅₆₃₆₆₂ and since 8380621 and 563662 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8380621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8380661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4190310 + 4190311.

It is an arithmetic number, because the mean of its divisors is an integer number (4190311).

Almost surely, 2^8380621 is an apocalyptic number.

It is an amenable number.

8380621 is a deficient number, since it is larger than the sum of its proper divisors (1).

8380621 is an equidigital number, since it uses as much as digits as its factorization.

8380621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8380621 is about 2894.9302236842. The cubic root of 8380621 is about 203.1228276217.

The spelling of 8380621 in words is "eight million, three hundred eighty thousand, six hundred twenty-one".