103989 has 8 divisors (see below), whose sum is σ = 146880. Its totient is φ = 65216.

The previous prime is 103981. The next prime is 103991. The reversal of 103989 is 989301.

103989 = T₁₀₂ + T₁₀₃ + ... + T₁₁₈.

It is a happy number.

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 103989 - 2³ = 103981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (103981) 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, 969 + ... + 1070.

It is an arithmetic number, because the mean of its divisors is an integer number (18360).

2¹⁰³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

103989 is a deficient number, since it is larger than the sum of its proper divisors (42891).

103989 is a wasteful number, since it uses less digits than its factorization.

103989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2059.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 103989 is about 322.4732547049. The cubic root of 103989 is about 47.0250357035.

It can be divided in two parts, 1039 and 89, that added together give a triangular number (1128 = T₄₇).

The spelling of 103989 in words is "one hundred three thousand, nine hundred eighty-nine".