123705145 has 4 divisors (see below), whose sum is σ = 148446180. Its totient is φ = 98964112.

The previous prime is 123705139. The next prime is 123705157. The reversal of 123705145 is 541507321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 541507321 = 37 ⋅14635333.

It can be written as a sum of positive squares in 2 ways, for example, as 23785129 + 99920016 = 4877^2 + 9996^2 .

It is a cyclic number.

It is not a de Polignac number, because 123705145 - 2¹³ = 123696953 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12370510 + ... + 12370519.

It is an arithmetic number, because the mean of its divisors is an integer number (37111545).

Almost surely, 2^123705145 is an apocalyptic number.

It is an amenable number.

123705145 is a deficient number, since it is larger than the sum of its proper divisors (24741035).

123705145 is an equidigital number, since it uses as much as digits as its factorization.

123705145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24741034.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 123705145 is about 11122.2814655987. The cubic root of 123705145 is about 498.2675307001.

The spelling of 123705145 in words is "one hundred twenty-three million, seven hundred five thousand, one hundred forty-five".