639329147 has 2 divisors, whose sum is σ = 639329148. Its totient is φ = 639329146.

The previous prime is 639329129. The next prime is 639329153. The reversal of 639329147 is 741923936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639329147 - 2¹⁴ = 639312763 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 639329098 and 639329107.

It is not a weakly prime, because it can be changed into another prime (639329107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319664573 + 319664574.

It is an arithmetic number, because the mean of its divisors is an integer number (319664574).

Almost surely, 2^639329147 is an apocalyptic number.

639329147 is a deficient number, since it is larger than the sum of its proper divisors (1).

639329147 is an equidigital number, since it uses as much as digits as its factorization.

639329147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 244944, while the sum is 44.

The square root of 639329147 is about 25284.9589084104. The cubic root of 639329147 is about 861.4726647077.

The spelling of 639329147 in words is "six hundred thirty-nine million, three hundred twenty-nine thousand, one hundred forty-seven".