123888857 has 4 divisors (see below), whose sum is σ = 124678116. Its totient is φ = 123099600.

The previous prime is 123888799. The next prime is 123888859. The reversal of 123888857 is 758888321.

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 58537801 + 65351056 = 7651^2 + 8084^2 .

It is a cyclic number.

It is not a de Polignac number, because 123888857 - 2⁸ = 123888601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123888859) 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, 394394 + ... + 394707.

It is an arithmetic number, because the mean of its divisors is an integer number (31169529).

Almost surely, 2^123888857 is an apocalyptic number.

It is an amenable number.

123888857 is a deficient number, since it is larger than the sum of its proper divisors (789259).

123888857 is an equidigital number, since it uses as much as digits as its factorization.

123888857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789258.

The product of its digits is 860160, while the sum is 50.

The square root of 123888857 is about 11130.5371388806. The cubic root of 123888857 is about 498.5140643652.

The spelling of 123888857 in words is "one hundred twenty-three million, eight hundred eighty-eight thousand, eight hundred fifty-seven".