123865875 has 128 divisors (see below), whose sum is σ = 269568000. Its totient is φ = 56095200.

The previous prime is 123865867. The next prime is 123865877. The reversal of 123865875 is 578568321.

It is not a de Polignac number, because 123865875 - 2³ = 123865867 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 123865875.

It is not an unprimeable number, because it can be changed into a prime (123865877) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1157572 + ... + 1157678.

It is an arithmetic number, because the mean of its divisors is an integer number (2106000).

Almost surely, 2^123865875 is an apocalyptic number.

123865875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123865875 is an abundant number, since it is smaller than the sum of its proper divisors (145702125).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123865875 is an equidigital number, since it uses as much as digits as its factorization.

123865875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 122 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 123865875 is about 11129.5047059606. The cubic root of 123865875 is about 498.4832368450.

The spelling of 123865875 in words is "one hundred twenty-three million, eight hundred sixty-five thousand, eight hundred seventy-five".