123806665 has 16 divisors (see below), whose sum is σ = 157759488. Its totient is φ = 92951296.

The previous prime is 123806623. The next prime is 123806689. The reversal of 123806665 is 566608321.

It is a cyclic number.

It is not a de Polignac number, because 123806665 - 2⁷ = 123806537 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 30654 + ... + 34456.

It is an arithmetic number, because the mean of its divisors is an integer number (9859968).

Almost surely, 2^123806665 is an apocalyptic number.

It is an amenable number.

123806665 is a deficient number, since it is larger than the sum of its proper divisors (33952823).

123806665 is a wasteful number, since it uses less digits than its factorization.

123806665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 123806665 is about 11126.8443415013. The cubic root of 123806665 is about 498.4037963571.

The spelling of 123806665 in words is "one hundred twenty-three million, eight hundred six thousand, six hundred sixty-five".