639790342 has 8 divisors (see below), whose sum is σ = 1016137656. Its totient is φ = 301077792.

The previous prime is 639790337. The next prime is 639790351. The reversal of 639790342 is 243097936.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9408648 + ... + 9408715.

It is an arithmetic number, because the mean of its divisors is an integer number (127017207).

Almost surely, 2^639790342 is an apocalyptic number.

639790342 is a deficient number, since it is larger than the sum of its proper divisors (376347314).

639790342 is a wasteful number, since it uses less digits than its factorization.

639790342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18817382.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 639790342 is about 25294.0772118692. The cubic root of 639790342 is about 861.6797627209.

The spelling of 639790342 in words is "six hundred thirty-nine million, seven hundred ninety thousand, three hundred forty-two".