123865755 has 24 divisors (see below), whose sum is σ = 213698352. Its totient is φ = 60903552.

The previous prime is 123865733. The next prime is 123865771. The reversal of 123865755 is 557568321.

It is not a de Polignac number, because 123865755 - 2¹⁸ = 123603611 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155017 + ... + 155813.

It is an arithmetic number, because the mean of its divisors is an integer number (8904098).

Almost surely, 2^123865755 is an apocalyptic number.

123865755 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123865755 is a deficient number, since it is larger than the sum of its proper divisors (89832597).

123865755 is an frugal number, since it uses more digits than its factorization.

123865755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 818 counting only the distinct ones).

The product of its digits is 252000, while the sum is 42.

The square root of 123865755 is about 11129.4993148838. The cubic root of 123865755 is about 498.4830758697.

The spelling of 123865755 in words is "one hundred twenty-three million, eight hundred sixty-five thousand, seven hundred fifty-five".