639038 has 4 divisors (see below), whose sum is σ = 958560. Its totient is φ = 319518.

The previous prime is 639011. The next prime is 639043. The reversal of 639038 is 830936.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 639038.

It is a congruent number.

It is an unprimeable number.

639038 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159758 + ... + 159761.

It is an arithmetic number, because the mean of its divisors is an integer number (239640).

2⁶³⁹⁰³⁸ is an apocalyptic number.

639038 is a deficient number, since it is larger than the sum of its proper divisors (319522).

639038 is a wasteful number, since it uses less digits than its factorization.

639038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319521.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 639038 is about 799.3985238916. The cubic root of 639038 is about 86.1341874871.

The spelling of 639038 in words is "six hundred thirty-nine thousand, thirty-eight".