7663421 has 2 divisors, whose sum is σ = 7663422. Its totient is φ = 7663420.

The previous prime is 7663399. The next prime is 7663427. The reversal of 7663421 is 1243667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5827396 + 1836025 = 2414^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 7663421 - 2¹⁰ = 7662397 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 (7663427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3831710 + 3831711.

It is an arithmetic number, because the mean of its divisors is an integer number (3831711).

Almost surely, 2^7663421 is an apocalyptic number.

It is an amenable number.

7663421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7663421 is an equidigital number, since it uses as much as digits as its factorization.

7663421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 29.

The square root of 7663421 is about 2768.2884604029. The cubic root of 7663421 is about 197.1548937700.

The spelling of 7663421 in words is "seven million, six hundred sixty-three thousand, four hundred twenty-one".