6420457 has 2 divisors, whose sum is σ = 6420458. Its totient is φ = 6420456.

The previous prime is 6420451. The next prime is 6420467. The reversal of 6420457 is 7540246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3308761 + 3111696 = 1819^2 + 1764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420457 is a prime.

It is not a weakly prime, because it can be changed into another prime (6420451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210228 + 3210229.

It is an arithmetic number, because the mean of its divisors is an integer number (3210229).

Almost surely, 2^6420457 is an apocalyptic number.

It is an amenable number.

6420457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420457 is an equidigital number, since it uses as much as digits as its factorization.

6420457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 6420457 is about 2533.8620720158. The cubic root of 6420457 is about 185.8611616624.

It can be divided in two parts, 64204 and 57, that added together give a triangular number (64261 = T₃₅₈).

The spelling of 6420457 in words is "six million, four hundred twenty thousand, four hundred fifty-seven".