639703394 has 8 divisors (see below), whose sum is σ = 1046787408. Its totient is φ = 290774260.

The previous prime is 639703391. The next prime is 639703409. The reversal of 639703394 is 493307936.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (639703391) 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 3 ways as a sum of consecutive naturals, for example, 14538692 + ... + 14538735.

It is an arithmetic number, because the mean of its divisors is an integer number (130848426).

Almost surely, 2^639703394 is an apocalyptic number.

639703394 is a deficient number, since it is larger than the sum of its proper divisors (407084014).

639703394 is a wasteful number, since it uses less digits than its factorization.

639703394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29077440.

The product of its (nonzero) digits is 367416, while the sum is 44.

The square root of 639703394 is about 25292.3584111882. The cubic root of 639703394 is about 861.6407266381.

The spelling of 639703394 in words is "six hundred thirty-nine million, seven hundred three thousand, three hundred ninety-four".