6639467 has 2 divisors, whose sum is σ = 6639468. Its totient is φ = 6639466.

The previous prime is 6639449. The next prime is 6639481. The reversal of 6639467 is 7649366.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6639467 - 2¹⁸ = 6377323 is a prime.

It is a d-powerful number, because it can be written as 6 + 6⁶ + 3⁵ + 9⁶ + 4⁷ + 6⁷ + 7⁸ .

It is not a weakly prime, because it can be changed into another prime (6639407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3319733 + 3319734.

It is an arithmetic number, because the mean of its divisors is an integer number (3319734).

Almost surely, 2^6639467 is an apocalyptic number.

6639467 is a deficient number, since it is larger than the sum of its proper divisors (1).

6639467 is an equidigital number, since it uses as much as digits as its factorization.

6639467 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 41.

The square root of 6639467 is about 2576.7163212119. The cubic root of 6639467 is about 187.9508982225.

The spelling of 6639467 in words is "six million, six hundred thirty-nine thousand, four hundred sixty-seven".