639863029 has 8 divisors (see below), whose sum is σ = 703745280. Its totient is φ = 578075376.

The previous prime is 639863023. The next prime is 639863039. The reversal of 639863029 is 920368936.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 639863029 - 2⁵ = 639862997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 639863029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639863023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523009 + ... + 524230.

It is an arithmetic number, because the mean of its divisors is an integer number (87968160).

Almost surely, 2^639863029 is an apocalyptic number.

It is an amenable number.

639863029 is a deficient number, since it is larger than the sum of its proper divisors (63882251).

639863029 is a wasteful number, since it uses less digits than its factorization.

639863029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047299.

The product of its (nonzero) digits is 419904, while the sum is 46.

The square root of 639863029 is about 25295.5140094049. The cubic root of 639863029 is about 861.7123934860.

The spelling of 639863029 in words is "six hundred thirty-nine million, eight hundred sixty-three thousand, twenty-nine".