123654789 has 8 divisors (see below), whose sum is σ = 183192320. Its totient is φ = 82436508.

The previous prime is 123654757. The next prime is 123654823. The reversal of 123654789 is 987456321.

123654789 is a `hidden beast` number, since 1 + 23 + 6 + 547 + 89 = 666.

It is not a de Polignac number, because 123654789 - 2⁵ = 123654757 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123654389) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2289877 + ... + 2289930.

It is an arithmetic number, because the mean of its divisors is an integer number (22899040).

Almost surely, 2^123654789 is an apocalyptic number.

It is an amenable number.

123654789 is a deficient number, since it is larger than the sum of its proper divisors (59537531).

123654789 is an equidigital number, since it uses as much as digits as its factorization.

123654789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579816 (or 4579810 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 123654789 is about 11120.0174909934. The cubic root of 123654789 is about 498.1999124803.

The spelling of 123654789 in words is "one hundred twenty-three million, six hundred fifty-four thousand, seven hundred eighty-nine".