8215397 has 2 divisors, whose sum is σ = 8215398. Its totient is φ = 8215396.

The previous prime is 8215387. The next prime is 8215399. The reversal of 8215397 is 7935128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8116801 + 98596 = 2849^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 8215397 - 2¹⁶ = 8149861 is a prime.

Together with 8215399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8215399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4107698 + 4107699.

It is an arithmetic number, because the mean of its divisors is an integer number (4107699).

Almost surely, 2^8215397 is an apocalyptic number.

It is an amenable number.

8215397 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215397 is an equidigital number, since it uses as much as digits as its factorization.

8215397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 8215397 is about 2866.2513846486. The cubic root of 8215397 is about 201.7791020526.

The spelling of 8215397 in words is "eight million, two hundred fifteen thousand, three hundred ninety-seven".