6420637 has 4 divisors (see below), whose sum is σ = 6431040. Its totient is φ = 6410236.

The previous prime is 6420599. The next prime is 6420683. The reversal of 6420637 is 7360246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7360246 = 2 ⋅3680123.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420697) 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 in 3 ways as a sum of consecutive naturals, for example, 4213 + ... + 5530.

It is an arithmetic number, because the mean of its divisors is an integer number (1607760).

Almost surely, 2^6420637 is an apocalyptic number.

It is an amenable number.

6420637 is a deficient number, since it is larger than the sum of its proper divisors (10403).

6420637 is an equidigital number, since it uses as much as digits as its factorization.

6420637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10402.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 6420637 is about 2533.8975906694. The cubic root of 6420637 is about 185.8628985428.

The spelling of 6420637 in words is "six million, four hundred twenty thousand, six hundred thirty-seven".