123440115 has 16 divisors (see below), whose sum is σ = 197666208. Its totient is φ = 65780736.

The previous prime is 123440113. The next prime is 123440129. The reversal of 123440115 is 511044321.

It is not a de Polignac number, because 123440115 - 2¹ = 123440113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123440091 and 123440100.

It is not an unprimeable number, because it can be changed into a prime (123440113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21379 + ... + 26531.

It is an arithmetic number, because the mean of its divisors is an integer number (12354138).

Almost surely, 2^123440115 is an apocalyptic number.

123440115 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123440115 is a deficient number, since it is larger than the sum of its proper divisors (74226093).

123440115 is a wasteful number, since it uses less digits than its factorization.

123440115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6758.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 123440115 is about 11110.3607052157. The cubic root of 123440115 is about 497.9114413259.

Adding to 123440115 its reverse (511044321), we get a palindrome (634484436).

The spelling of 123440115 in words is "one hundred twenty-three million, four hundred forty thousand, one hundred fifteen".