6392989 has 2 divisors, whose sum is σ = 6392990. Its totient is φ = 6392988.

The previous prime is 6392951. The next prime is 6392999. The reversal of 6392989 is 9892936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5522500 + 870489 = 2350^2 + 933^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6392989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6392999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3196494 + 3196495.

It is an arithmetic number, because the mean of its divisors is an integer number (3196495).

Almost surely, 2^6392989 is an apocalyptic number.

It is an amenable number.

6392989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6392989 is an equidigital number, since it uses as much as digits as its factorization.

6392989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 6392989 is about 2528.4360778948. The cubic root of 6392989 is about 185.5957323663.

It can be divided in two parts, 6392 and 989, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 6392989 in words is "six million, three hundred ninety-two thousand, nine hundred eighty-nine".