639814343 has 8 divisors (see below), whose sum is σ = 731388288. Its totient is φ = 548283384.

The previous prime is 639814333. The next prime is 639814361. The reversal of 639814343 is 343418936.

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 639814343 - 2²⁴ = 623037127 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 639814343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639814313) 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, 33080 + ... + 48722.

It is an arithmetic number, because the mean of its divisors is an integer number (91423536).

Almost surely, 2^639814343 is an apocalyptic number.

639814343 is a deficient number, since it is larger than the sum of its proper divisors (91573945).

639814343 is a wasteful number, since it uses less digits than its factorization.

639814343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21493.

The product of its digits is 186624, while the sum is 41.

The square root of 639814343 is about 25294.5516465503. The cubic root of 639814343 is about 861.6905375618.

The spelling of 639814343 in words is "six hundred thirty-nine million, eight hundred fourteen thousand, three hundred forty-three".