123408681 has 16 divisors (see below), whose sum is σ = 180880128. Its totient is φ = 74219600.

The previous prime is 123408671. The next prime is 123408689. The reversal of 123408681 is 186804321.

It is a cyclic number.

It is not a de Polignac number, because 123408681 - 2¹⁰ = 123407657 is a prime.

It is a super-2 number, since 2×123408681² = 30459405092319522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (123408689) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 9951 + ... + 18596.

It is an arithmetic number, because the mean of its divisors is an integer number (11305008).

Almost surely, 2^123408681 is an apocalyptic number.

123408681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123408681 is a deficient number, since it is larger than the sum of its proper divisors (57471447).

123408681 is a wasteful number, since it uses less digits than its factorization.

123408681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28692.

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 123408681 is about 11108.9459896068. The cubic root of 123408681 is about 497.8691733890.

It can be divided in two parts, 123 and 408681, that added together give a palindrome (408804).

The spelling of 123408681 in words is "one hundred twenty-three million, four hundred eight thousand, six hundred eighty-one".