123886505 has 4 divisors (see below), whose sum is σ = 148663812. Its totient is φ = 99109200.

The previous prime is 123886459. The next prime is 123886519. The reversal of 123886505 is 505688321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32855824 + 91030681 = 5732^2 + 9541^2 .

It is not a de Polignac number, because 123886505 - 2¹⁰ = 123885481 is a prime.

It is a super-2 number, since 2×123886505² = 30695732242230050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12388646 + ... + 12388655.

It is an arithmetic number, because the mean of its divisors is an integer number (37165953).

Almost surely, 2^123886505 is an apocalyptic number.

It is an amenable number.

123886505 is a deficient number, since it is larger than the sum of its proper divisors (24777307).

123886505 is an equidigital number, since it uses as much as digits as its factorization.

123886505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24777306.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 123886505 is about 11130.4314831007. The cubic root of 123886505 is about 498.5109096222.

The spelling of 123886505 in words is "one hundred twenty-three million, eight hundred eighty-six thousand, five hundred five".