6419989 has 2 divisors, whose sum is σ = 6419990. Its totient is φ = 6419988.

The previous prime is 6419983. The next prime is 6420023. The reversal of 6419989 is 9899146.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6041764 + 378225 = 2458^2 + 615^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6419989 is a prime.

6419989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6419983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3209994 + 3209995.

It is an arithmetic number, because the mean of its divisors is an integer number (3209995).

Almost surely, 2^6419989 is an apocalyptic number.

It is an amenable number.

6419989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6419989 is an equidigital number, since it uses as much as digits as its factorization.

6419989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 6419989 is about 2533.7697211862. The cubic root of 6419989 is about 185.8566456216.

The spelling of 6419989 in words is "six million, four hundred nineteen thousand, nine hundred eighty-nine".