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123103 = 257479

123103 has 4 divisors (see below), whose sum is σ = 123840. Its totient is φ = 122368.

The previous prime is 123091. The next prime is 123113. The reversal of 123103 is 301321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 301321 = 1915859.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-123103 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 123103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123113) 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, 18 + ... + 496.

It is an arithmetic number, because the mean of its divisors is an integer number (30960).

2123103 is an apocalyptic number.

123103 is a deficient number, since it is larger than the sum of its proper divisors (737).

123103 is an equidigital number, since it uses as much as digits as its factorization.

123103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 123103 is about 350.8603710880. The cubic root of 123103 is about 49.7457762632.

Adding to 123103 its reverse (301321), we get a palindrome (424424).

It can be divided in two parts, 1 and 23103, that added together give a square (23104 = 1522).

The spelling of 123103 in words is "one hundred twenty-three thousand, one hundred three", and thus it is an iban number.

Divisors: 1 257 479 123103