639094 has 4 divisors (see below), whose sum is σ = 958644. Its totient is φ = 319546.

The previous prime is 639091. The next prime is 639137. The reversal of 639094 is 490936.

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

It is a super-2 number, since 2×639094² = 816882281672, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159772 + ... + 159775.

It is an arithmetic number, because the mean of its divisors is an integer number (239661).

2⁶³⁹⁰⁹⁴ is an apocalyptic number.

639094 is a deficient number, since it is larger than the sum of its proper divisors (319550).

639094 is a wasteful number, since it uses less digits than its factorization.

639094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319549.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 639094 is about 799.4335494586. The cubic root of 639094 is about 86.1367034426.

The spelling of 639094 in words is "six hundred thirty-nine thousand, ninety-four".