7429421 has 2 divisors, whose sum is σ = 7429422. Its totient is φ = 7429420.

The previous prime is 7429379. The next prime is 7429439. The reversal of 7429421 is 1249247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5221225 + 2208196 = 2285^2 + 1486^2 .

It is an emirp because it is prime and its reverse (1249247) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7429421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7429441) 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, 3714710 + 3714711.

It is an arithmetic number, because the mean of its divisors is an integer number (3714711).

Almost surely, 2^7429421 is an apocalyptic number.

It is an amenable number.

7429421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7429421 is an equidigital number, since it uses as much as digits as its factorization.

7429421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 29.

The square root of 7429421 is about 2725.6964247693. The cubic root of 7429421 is about 195.1274293102.

The spelling of 7429421 in words is "seven million, four hundred twenty-nine thousand, four hundred twenty-one".