639373 has 8 divisors (see below), whose sum is σ = 735680. Its totient is φ = 544320.

The previous prime is 639371. The next prime is 639391. The reversal of 639373 is 373936.

It is a happy number.

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

It is not a de Polignac number, because 639373 - 2¹ = 639371 is a prime.

It is a Duffinian number.

639373 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639371) 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, 1498 + ... + 1876.

It is an arithmetic number, because the mean of its divisors is an integer number (91960).

2⁶³⁹³⁷³ is an apocalyptic number.

It is an amenable number.

639373 is a deficient number, since it is larger than the sum of its proper divisors (96307).

639373 is a wasteful number, since it uses less digits than its factorization.

639373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627.

The product of its digits is 10206, while the sum is 31.

The square root of 639373 is about 799.6080289742. The cubic root of 639373 is about 86.1492361029.

The spelling of 639373 in words is "six hundred thirty-nine thousand, three hundred seventy-three".