123613405 has 8 divisors (see below), whose sum is σ = 149865912. Its totient is φ = 97870848.

The previous prime is 123613387. The next prime is 123613421. The reversal of 123613405 is 504316321.

It can be written as a sum of positive squares in 4 ways, for example, as 3481 + 123609924 = 59^2 + 11118^2 .

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 123613405 - 2⁷ = 123613277 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 123613405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126952 + ... + 127921.

It is an arithmetic number, because the mean of its divisors is an integer number (18733239).

Almost surely, 2^123613405 is an apocalyptic number.

It is an amenable number.

123613405 is a deficient number, since it is larger than the sum of its proper divisors (26252507).

123613405 is an equidigital number, since it uses as much as digits as its factorization.

123613405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254975.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 123613405 is about 11118.1565468381. The cubic root of 123613405 is about 498.1443281507.

Adding to 123613405 its reverse (504316321), we get a palindrome (627929726).

It can be divided in two parts, 1236 and 13405, that added together give a palindrome (14641).

The spelling of 123613405 in words is "one hundred twenty-three million, six hundred thirteen thousand, four hundred five".