123240013 has 4 divisors (see below), whose sum is σ = 132720028. Its totient is φ = 113760000.

The previous prime is 123240011. The next prime is 123240043. The reversal of 123240013 is 310042321.

It is a happy number.

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 80245764 + 42994249 = 8958^2 + 6557^2 .

It is a cyclic number.

It is not a de Polignac number, because 123240013 - 2¹ = 123240011 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739988 + ... + 4740013.

It is an arithmetic number, because the mean of its divisors is an integer number (33180007).

Almost surely, 2^123240013 is an apocalyptic number.

123240013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123240013 is a deficient number, since it is larger than the sum of its proper divisors (9480015).

123240013 is an equidigital number, since it uses as much as digits as its factorization.

123240013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480014.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 123240013 is about 11101.3518546166. The cubic root of 123240013 is about 497.6422501738.

Adding to 123240013 its reverse (310042321), we get a palindrome (433282334).

The spelling of 123240013 in words is "one hundred twenty-three million, two hundred forty thousand, thirteen".