639959829 has 8 divisors (see below), whose sum is σ = 864968832. Its totient is φ = 420795360.

The previous prime is 639959783. The next prime is 639959839. The reversal of 639959829 is 928959936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 639959829 - 2¹⁵ = 639927061 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639959839) by changing a digit.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460877 + ... + 1461314.

It is an arithmetic number, because the mean of its divisors is an integer number (108121104).

Almost surely, 2^639959829 is an apocalyptic number.

It is an amenable number.

639959829 is a deficient number, since it is larger than the sum of its proper divisors (225009003).

639959829 is a wasteful number, since it uses less digits than its factorization.

639959829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922267.

The product of its digits is 9447840, while the sum is 60.

The square root of 639959829 is about 25297.4273197889. The cubic root of 639959829 is about 861.7558452613.

The spelling of 639959829 in words is "six hundred thirty-nine million, nine hundred fifty-nine thousand, eight hundred twenty-nine".