123420113 has 4 divisors (see below), whose sum is σ = 124573680. Its totient is φ = 122266548.
The previous prime is 123420071. The next prime is 123420137. The reversal of 123420113 is 311024321.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311024321 = 15013 ⋅20717.
It is a cyclic number.
It is not a de Polignac number, because 123420113 - 210 = 123419089 is a prime.
It is a Curzon number.
It is a junction number, because it is equal to n+sod(n) for n = 123420091 and 123420100.
It is not an unprimeable number, because it can be changed into a prime (123420173) 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 3 ways as a sum of consecutive naturals, for example, 576623 + ... + 576836.
It is an arithmetic number, because the mean of its divisors is an integer number (31143420).
Almost surely, 2123420113 is an apocalyptic number.
It is an amenable number.
123420113 is a deficient number, since it is larger than the sum of its proper divisors (1153567).
123420113 is a wasteful number, since it uses less digits than its factorization.
123420113 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1153566.
The product of its (nonzero) digits is 144, while the sum is 17.
The square root of 123420113 is about 11109.4605179550. The cubic root of 123420113 is about 497.8845463342.
Adding to 123420113 its reverse (311024321), we get a palindrome (434444434).
The spelling of 123420113 in words is "one hundred twenty-three million, four hundred twenty thousand, one hundred thirteen".
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