123805906 has 16 divisors (see below), whose sum is σ = 214188480. Its totient is φ = 52572240.

The previous prime is 123805879. The next prime is 123805907. The reversal of 123805906 is 609508321.

It is not an unprimeable number, because it can be changed into a prime (123805907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39040 + ... + 42091.

It is an arithmetic number, because the mean of its divisors is an integer number (13386780).

Almost surely, 2^123805906 is an apocalyptic number.

123805906 is a deficient number, since it is larger than the sum of its proper divisors (90382574).

123805906 is a wasteful number, since it uses less digits than its factorization.

123805906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81249.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 123805906 is about 11126.8102347438. The cubic root of 123805906 is about 498.4027778625.

The spelling of 123805906 in words is "one hundred twenty-three million, eight hundred five thousand, nine hundred six".