639792029 has 2 divisors, whose sum is σ = 639792030. Its totient is φ = 639792028.

The previous prime is 639791963. The next prime is 639792037. The reversal of 639792029 is 920297936.

639792029 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575760025 + 64032004 = 23995^2 + 8002^2 .

It is a cyclic number.

It is not a de Polignac number, because 639792029 - 2¹² = 639787933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639792929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319896014 + 319896015.

It is an arithmetic number, because the mean of its divisors is an integer number (319896015).

Almost surely, 2^639792029 is an apocalyptic number.

It is an amenable number.

639792029 is a deficient number, since it is larger than the sum of its proper divisors (1).

639792029 is an equidigital number, since it uses as much as digits as its factorization.

639792029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 639792029 is about 25294.1105595749. The cubic root of 639792029 is about 861.6805200797.

The spelling of 639792029 in words is "six hundred thirty-nine million, seven hundred ninety-two thousand, twenty-nine".