123905728445 has 4 divisors (see below), whose sum is σ = 148686874140. Its totient is φ = 99124582752.

The previous prime is 123905728393. The next prime is 123905728447. The reversal of 123905728445 is 544827509321.

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 44008487524 + 79897240921 = 209782^2 + 282661^2 .

It is a cyclic number.

It is not a de Polignac number, because 123905728445 - 2⁸ = 123905728189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123905728393 and 123905728402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123905728447) 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, 12390572840 + ... + 12390572849.

It is an arithmetic number, because the mean of its divisors is an integer number (37171718535).

Almost surely, 2^123905728445 is an apocalyptic number.

It is an amenable number.

123905728445 is a deficient number, since it is larger than the sum of its proper divisors (24781145695).

123905728445 is an equidigital number, since it uses as much as digits as its factorization.

123905728445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24781145694.

The product of its (nonzero) digits is 2419200, while the sum is 50.

The spelling of 123905728445 in words is "one hundred twenty-three billion, nine hundred five million, seven hundred twenty-eight thousand, four hundred forty-five".