123543607405 has 4 divisors (see below), whose sum is σ = 148252328892. Its totient is φ = 98834885920.

The previous prime is 123543607403. The next prime is 123543607423. The reversal of 123543607405 is 504706345321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40319435209 + 83224172196 = 200797^2 + 288486^2 .

It is not a de Polignac number, because 123543607405 - 2¹ = 123543607403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123543607403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12354360736 + ... + 12354360745.

It is an arithmetic number, because the mean of its divisors is an integer number (37063082223).

Almost surely, 2^123543607405 is an apocalyptic number.

It is an amenable number.

123543607405 is a deficient number, since it is larger than the sum of its proper divisors (24708721487).

123543607405 is an equidigital number, since it uses as much as digits as its factorization.

123543607405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24708721486.

The product of its (nonzero) digits is 302400, while the sum is 40.

The spelling of 123543607405 in words is "one hundred twenty-three billion, five hundred forty-three million, six hundred seven thousand, four hundred five".