100039 has 4 divisors (see below), whose sum is σ = 101520. Its totient is φ = 98560.

The previous prime is 100019. The next prime is 100043. The reversal of 100039 is 930001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930001 = 29 ⋅32069.

It is a cyclic number.

It is not a de Polignac number, because 100039 - 2⁹ = 99527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 634 + ... + 775.

It is an arithmetic number, because the mean of its divisors is an integer number (25380).

2¹⁰⁰⁰³⁹ is an apocalyptic number.

100039 is a deficient number, since it is larger than the sum of its proper divisors (1481).

100039 is an equidigital number, since it uses as much as digits as its factorization.

100039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 100039 is about 316.2894244201. The cubic root of 100039 is about 46.4219216174.

The spelling of 100039 in words is "one hundred thousand, thirty-nine".