103405 has 4 divisors (see below), whose sum is σ = 124092. Its totient is φ = 82720.

The previous prime is 103399. The next prime is 103409. The reversal of 103405 is 504301.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504301 = 7 ⋅72043.

It can be written as a sum of positive squares in 2 ways, for example, as 21609 + 81796 = 147^2 + 286^2 .

It is not a de Polignac number, because 103405 - 2¹³ = 95213 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 (103409) 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 3 ways as a sum of consecutive naturals, for example, 10336 + ... + 10345.

It is an arithmetic number, because the mean of its divisors is an integer number (31023).

2¹⁰³⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

103405 is a deficient number, since it is larger than the sum of its proper divisors (20687).

103405 is an equidigital number, since it uses as much as digits as its factorization.

103405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20686.

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 103405 is about 321.5664783525. The cubic root of 103405 is about 46.9368398633.

Adding to 103405 its reverse (504301), we get a palindrome (607706).

The spelling of 103405 in words is "one hundred three thousand, four hundred five".