6457421 has 2 divisors, whose sum is σ = 6457422. Its totient is φ = 6457420.

The previous prime is 6457417. The next prime is 6457441. The reversal of 6457421 is 1247546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 81796 = 2525^2 + 286^2 .

It is a cyclic number.

It is not a de Polignac number, because 6457421 - 2² = 6457417 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 (6457441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3228710 + 3228711.

It is an arithmetic number, because the mean of its divisors is an integer number (3228711).

Almost surely, 2^6457421 is an apocalyptic number.

It is an amenable number.

6457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6457421 is an equidigital number, since it uses as much as digits as its factorization.

6457421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 29.

The square root of 6457421 is about 2541.1456077919. The cubic root of 6457421 is about 186.2171607042.

The spelling of 6457421 in words is "six million, four hundred fifty-seven thousand, four hundred twenty-one".