6420437 has 2 divisors, whose sum is σ = 6420438. Its totient is φ = 6420436.

The previous prime is 6420431. The next prime is 6420451. The reversal of 6420437 is 7340246.

It is a happy number.

6420437 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6345361 + 75076 = 2519^2 + 274^2 .

It is a cyclic number.

It is not a de Polignac number, because 6420437 - 2¹⁸ = 6158293 is a prime.

It is a super-2 number, since 2×6420437² = 82444022541938, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210218 + 3210219.

It is an arithmetic number, because the mean of its divisors is an integer number (3210219).

Almost surely, 2^6420437 is an apocalyptic number.

It is an amenable number.

6420437 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420437 is an equidigital number, since it uses as much as digits as its factorization.

6420437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 6420437 is about 2533.8581254680. The cubic root of 6420437 is about 185.8609686737.

The spelling of 6420437 in words is "six million, four hundred twenty thousand, four hundred thirty-seven".