7639421 has 2 divisors, whose sum is σ = 7639422. Its totient is φ = 7639420.

The previous prime is 7639417. The next prime is 7639433. The reversal of 7639421 is 1249367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5707321 + 1932100 = 2389^2 + 1390^2 .

It is a cyclic number.

It is not a de Polignac number, because 7639421 - 2² = 7639417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7639481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819710 + 3819711.

It is an arithmetic number, because the mean of its divisors is an integer number (3819711).

Almost surely, 2^7639421 is an apocalyptic number.

It is an amenable number.

7639421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7639421 is an equidigital number, since it uses as much as digits as its factorization.

7639421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 32.

The square root of 7639421 is about 2763.9502528085. The cubic root of 7639421 is about 196.9488645655.

The spelling of 7639421 in words is "seven million, six hundred thirty-nine thousand, four hundred twenty-one".