8487421 has 2 divisors, whose sum is σ = 8487422. Its totient is φ = 8487420.

The previous prime is 8487419. The next prime is 8487527. The reversal of 8487421 is 1247848.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8468100 + 19321 = 2910^2 + 139^2 .

It is a cyclic number.

It is not a de Polignac number, because 8487421 - 2¹ = 8487419 is a prime.

Together with 8487419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8487121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4243710 + 4243711.

It is an arithmetic number, because the mean of its divisors is an integer number (4243711).

Almost surely, 2^8487421 is an apocalyptic number.

It is an amenable number.

8487421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8487421 is an equidigital number, since it uses as much as digits as its factorization.

8487421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 34.

The square root of 8487421 is about 2913.3178679986. The cubic root of 8487421 is about 203.9820325711.

The spelling of 8487421 in words is "eight million, four hundred eighty-seven thousand, four hundred twenty-one".