639355 has 8 divisors (see below), whose sum is σ = 778464. Its totient is φ = 504000.

The previous prime is 639337. The next prime is 639361. The reversal of 639355 is 553936.

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

It is not a de Polignac number, because 639355 - 2¹⁵ = 606587 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 546 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (97308).

2⁶³⁹³⁵⁵ is an apocalyptic number.

639355 is a deficient number, since it is larger than the sum of its proper divisors (139109).

639355 is a wasteful number, since it uses less digits than its factorization.

639355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877.

The product of its digits is 12150, while the sum is 31.

The square root of 639355 is about 799.5967733802. The cubic root of 639355 is about 86.1484276542.

The spelling of 639355 in words is "six hundred thirty-nine thousand, three hundred fifty-five".