8719421 has 2 divisors, whose sum is σ = 8719422. Its totient is φ = 8719420.

The previous prime is 8719391. The next prime is 8719441. The reversal of 8719421 is 1249178.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7778521 + 940900 = 2789^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 8719421 - 2¹⁸ = 8457277 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8719441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4359710 + 4359711.

It is an arithmetic number, because the mean of its divisors is an integer number (4359711).

Almost surely, 2^8719421 is an apocalyptic number.

It is an amenable number.

8719421 is a deficient number, since it is larger than the sum of its proper divisors (1).

8719421 is an equidigital number, since it uses as much as digits as its factorization.

8719421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 32.

The square root of 8719421 is about 2952.8665733487. The cubic root of 8719421 is about 205.8239376058.

The spelling of 8719421 in words is "eight million, seven hundred nineteen thousand, four hundred twenty-one".