123440105 has 8 divisors (see below), whose sum is σ = 148371912. Its totient is φ = 98589568.

The previous prime is 123440101. The next prime is 123440113. The reversal of 123440105 is 501044321.

It can be written as a sum of positive squares in 4 ways, for example, as 52441 + 123387664 = 229^2 + 11108^2 .

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 123440105 - 2² = 123440101 is a prime.

It is a super-2 number, since 2×123440105² = 30474919044822050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123440101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16922 + ... + 23091.

It is an arithmetic number, because the mean of its divisors is an integer number (18546489).

Almost surely, 2^123440105 is an apocalyptic number.

It is an amenable number.

123440105 is a deficient number, since it is larger than the sum of its proper divisors (24931807).

123440105 is an equidigital number, since it uses as much as digits as its factorization.

123440105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40635.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 123440105 is about 11110.3602551852. The cubic root of 123440105 is about 497.9114278805.

Adding to 123440105 its reverse (501044321), we get a palindrome (624484426).

The spelling of 123440105 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred five".