8365421 has 2 divisors, whose sum is σ = 8365422. Its totient is φ = 8365420.

The previous prime is 8365417. The next prime is 8365447. The reversal of 8365421 is 1245638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5175625 + 3189796 = 2275^2 + 1786^2 .

It is a cyclic number.

It is not a de Polignac number, because 8365421 - 2² = 8365417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8365471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182710 + 4182711.

It is an arithmetic number, because the mean of its divisors is an integer number (4182711).

Almost surely, 2^8365421 is an apocalyptic number.

It is an amenable number.

8365421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8365421 is an equidigital number, since it uses as much as digits as its factorization.

8365421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 8365421 is about 2892.3037530661. The cubic root of 8365421 is about 202.9999514669. Note that the first 4 decimals are identical.

The spelling of 8365421 in words is "eight million, three hundred sixty-five thousand, four hundred twenty-one".