100639 has 8 divisors (see below), whose sum is σ = 125568. Its totient is φ = 78360.

The previous prime is 100621. The next prime is 100649. The reversal of 100639 is 936001.

100639 = 127² + 128² + ... + 132².

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

It is a cyclic number.

It is not a de Polignac number, because 100639 - 2⁷ = 100511 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100609) 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, 577 + ... + 730.

It is an arithmetic number, because the mean of its divisors is an integer number (15696).

2¹⁰⁰⁶³⁹ is an apocalyptic number.

100639 is a deficient number, since it is larger than the sum of its proper divisors (24929).

100639 is a wasteful number, since it uses less digits than its factorization.

100639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 100639 is about 317.2365048351. The cubic root of 100639 is about 46.5145443384.

The spelling of 100639 in words is "one hundred thousand, six hundred thirty-nine".