123681285 has 48 divisors (see below), whose sum is σ = 263862144. Its totient is φ = 52189056.

The previous prime is 123681247. The next prime is 123681323. The reversal of 123681285 is 582186321.

It is a happy number.

123681285 is a `hidden beast` number, since 12 + 368 + 1 + 285 = 666.

It is an interprime number because it is at equal distance from previous prime (123681247) and next prime (123681323).

It is not a de Polignac number, because 123681285 - 2²⁶ = 56572421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11007 + ... + 19196.

It is an arithmetic number, because the mean of its divisors is an integer number (5497128).

Almost surely, 2^123681285 is an apocalyptic number.

123681285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123681285 is an abundant number, since it is smaller than the sum of its proper divisors (140180859).

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

123681285 is a wasteful number, since it uses less digits than its factorization.

123681285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234 (or 30231 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 123681285 is about 11121.2087922132. The cubic root of 123681285 is about 498.2354936933.

The spelling of 123681285 in words is "one hundred twenty-three million, six hundred eighty-one thousand, two hundred eighty-five".