123885805 has 16 divisors (see below), whose sum is σ = 156414384. Its totient is φ = 94072320.

The previous prime is 123885799. The next prime is 123885821. The reversal of 123885805 is 508588321.

It can be written as a sum of positive squares in 8 ways, for example, as 16990884 + 106894921 = 4122^2 + 10339^2 .

It is not a de Polignac number, because 123885805 - 2⁷ = 123885677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 582 + ... + 15751.

It is an arithmetic number, because the mean of its divisors is an integer number (9775899).

Almost surely, 2^123885805 is an apocalyptic number.

It is an amenable number.

123885805 is a deficient number, since it is larger than the sum of its proper divisors (32528579).

123885805 is a wasteful number, since it uses less digits than its factorization.

123885805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16416.

The product of its (nonzero) digits is 76800, while the sum is 40.

The square root of 123885805 is about 11130.4000377345. The cubic root of 123885805 is about 498.5099707029.

The spelling of 123885805 in words is "one hundred twenty-three million, eight hundred eighty-five thousand, eight hundred five".