7297421 has 2 divisors, whose sum is σ = 7297422. Its totient is φ = 7297420.

The previous prime is 7297397. The next prime is 7297429. The reversal of 7297421 is 1247927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6325225 + 972196 = 2515^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7297421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7297429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3648710 + 3648711.

It is an arithmetic number, because the mean of its divisors is an integer number (3648711).

Almost surely, 2^7297421 is an apocalyptic number.

It is an amenable number.

7297421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7297421 is an equidigital number, since it uses as much as digits as its factorization.

7297421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 32.

The square root of 7297421 is about 2701.3739096985. The cubic root of 7297421 is about 193.9648942748.

The spelling of 7297421 in words is "seven million, two hundred ninety-seven thousand, four hundred twenty-one".