123435013 has 4 divisors (see below), whose sum is σ = 132930028. Its totient is φ = 113940000.

The previous prime is 123435007. The next prime is 123435017. The reversal of 123435013 is 310534321.

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 15233409 + 108201604 = 3903^2 + 10402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123435013 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 (123435017) 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, 4747488 + ... + 4747513.

It is an arithmetic number, because the mean of its divisors is an integer number (33232507).

Almost surely, 2^123435013 is an apocalyptic number.

123435013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123435013 is a deficient number, since it is larger than the sum of its proper divisors (9495015).

123435013 is an equidigital number, since it uses as much as digits as its factorization.

123435013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495014.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 123435013 is about 11110.1310973363. The cubic root of 123435013 is about 497.9045813756.

Adding to 123435013 its reverse (310534321), we get a palindrome (433969334).

The spelling of 123435013 in words is "one hundred twenty-three million, four hundred thirty-five thousand, thirteen".