123857855 has 16 divisors (see below), whose sum is σ = 162359424. Its totient is φ = 89957280.

The previous prime is 123857849. The next prime is 123857857. The reversal of 123857855 is 558758321.

It is not a de Polignac number, because 123857855 - 2⁶ = 123857791 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 (123857857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71024 + ... + 72746.

It is an arithmetic number, because the mean of its divisors is an integer number (10147464).

Almost surely, 2^123857855 is an apocalyptic number.

123857855 is a deficient number, since it is larger than the sum of its proper divisors (38501569).

123857855 is a wasteful number, since it uses less digits than its factorization.

123857855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046.

The product of its digits is 336000, while the sum is 44.

The square root of 123857855 is about 11129.1443965832. The cubic root of 123857855 is about 498.4724781060.

The spelling of 123857855 in words is "one hundred twenty-three million, eight hundred fifty-seven thousand, eight hundred fifty-five".