103945 has 4 divisors (see below), whose sum is σ = 124740. Its totient is φ = 83152.

The previous prime is 103919. The next prime is 103951. The reversal of 103945 is 549301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 549301 = 347 ⋅1583.

It can be written as a sum of positive squares in 2 ways, for example, as 67081 + 36864 = 259^2 + 192^2 .

It is a cyclic number.

It is not a de Polignac number, because 103945 - 2⁵ = 103913 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10390 + ... + 10399.

It is an arithmetic number, because the mean of its divisors is an integer number (31185).

2¹⁰³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

103945 is a deficient number, since it is larger than the sum of its proper divisors (20795).

103945 is an equidigital number, since it uses as much as digits as its factorization.

103945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20794.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 103945 is about 322.4050247747. The cubic root of 103945 is about 47.0184023306.

The spelling of 103945 in words is "one hundred three thousand, nine hundred forty-five".