123240015 has 32 divisors (see below), whose sum is σ = 221245440. Its totient is φ = 65082528.

The previous prime is 123240011. The next prime is 123240043. The reversal of 123240015 is 510042321.

It is not a de Polignac number, because 123240015 - 2² = 123240011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123240015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123240011) 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 31 ways as a sum of consecutive naturals, for example, 9474 + ... + 18336.

It is an arithmetic number, because the mean of its divisors is an integer number (6913920).

Almost surely, 2^123240015 is an apocalyptic number.

123240015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123240015 is a deficient number, since it is larger than the sum of its proper divisors (98005425).

123240015 is a wasteful number, since it uses less digits than its factorization.

123240015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8980 (or 8974 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 123240015 is about 11101.3519446957. The cubic root of 123240015 is about 497.6422528658.

Adding to 123240015 its reverse (510042321), we get a palindrome (633282336).

The spelling of 123240015 in words is "one hundred twenty-three million, two hundred forty thousand, fifteen".