13123405 has 16 divisors (see below), whose sum is σ = 16786224. Its totient is φ = 9815040.

The previous prime is 13123393. The next prime is 13123423. The reversal of 13123405 is 50432131.

It can be written as a sum of positive squares in 8 ways, for example, as 3407716 + 9715689 = 1846^2 + 3117^2 .

It is not a de Polignac number, because 13123405 - 2²³ = 4734797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14959 + ... + 15811.

It is an arithmetic number, because the mean of its divisors is an integer number (1049139).

Almost surely, 2^13123405 is an apocalyptic number.

It is an amenable number.

13123405 is a deficient number, since it is larger than the sum of its proper divisors (3662819).

13123405 is a wasteful number, since it uses less digits than its factorization.

13123405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 13123405 is about 3622.6240489457. The cubic root of 13123405 is about 235.8751434263.

Adding to 13123405 its reverse (50432131), we get a palindrome (63555536).

The spelling of 13123405 in words is "thirteen million, one hundred twenty-three thousand, four hundred five".