123612505 has 8 divisors (see below), whose sum is σ = 148672512. Its totient is φ = 98665008.

The previous prime is 123612421. The next prime is 123612509. The reversal of 123612505 is 505216321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 123612505 - 2¹¹ = 123610457 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123612505.

It is not an unprimeable number, because it can be changed into a prime (123612509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25689 + ... + 30118.

It is an arithmetic number, because the mean of its divisors is an integer number (18584064).

Almost surely, 2^123612505 is an apocalyptic number.

It is an amenable number.

123612505 is a deficient number, since it is larger than the sum of its proper divisors (25060007).

123612505 is an equidigital number, since it uses as much as digits as its factorization.

123612505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56255.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 123612505 is about 11118.1160724288. The cubic root of 123612505 is about 498.1431191907.

Adding to 123612505 its reverse (505216321), we get a palindrome (628828826).

The spelling of 123612505 in words is "one hundred twenty-three million, six hundred twelve thousand, five hundred five".