109939 has 8 divisors (see below), whose sum is σ = 120960. Its totient is φ = 99456.

The previous prime is 109937. The next prime is 109943. The reversal of 109939 is 939901.

109939 = 47² + 48² + ... + 75².

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 109939 - 2¹ = 109937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 109939.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109937) by changing a digit.

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, 382 + ... + 604.

It is an arithmetic number, because the mean of its divisors is an integer number (15120).

2¹⁰⁹⁹³⁹ is an apocalyptic number.

109939 is a deficient number, since it is larger than the sum of its proper divisors (11021).

109939 is a wasteful number, since it uses less digits than its factorization.

With its successor (109940) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (269).

109939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 109939 is about 331.5705053228. The cubic root of 109939 is about 47.9053400659.

The spelling of 109939 in words is "one hundred nine thousand, nine hundred thirty-nine".