639049 has 2 divisors, whose sum is σ = 639050. Its totient is φ = 639048.

The previous prime is 639043. The next prime is 639053. The reversal of 639049 is 940936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 53824 = 765^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 639049 - 2¹¹ = 637001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639049.

It is not a weakly prime, because it can be changed into another prime (639043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319524 + 319525.

It is an arithmetic number, because the mean of its divisors is an integer number (319525).

2⁶³⁹⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

639049 is a deficient number, since it is larger than the sum of its proper divisors (1).

639049 is an equidigital number, since it uses as much as digits as its factorization.

639049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 639049 is about 799.4054040348. The cubic root of 639049 is about 86.1346817042.

The spelling of 639049 in words is "six hundred thirty-nine thousand, forty-nine".