42123493 has 2 divisors, whose sum is σ = 42123494.
Its totient is φ = 42123492.
The previous prime is 42123481. The next prime is 42123509. The reversal of 42123493 is 39432124.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 33373729 + 8749764 = 5777^2 + 2958^2
It is a cyclic number.
It is not a de Polignac number, because 42123493 - 25 = 42123461 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (42123593) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061746 + 21061747.
It is an arithmetic number, because the mean of its divisors is an integer number (21061747).
Almost surely, 242123493 is an apocalyptic number.
It is an amenable number.
42123493 is a deficient number, since it is larger than the sum of its proper divisors (1).
42123493 is an equidigital number, since it uses as much as digits as its factorization.
42123493 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5184, while the sum is 28.
The square root of 42123493 is about 6490.2613968930.
The cubic root of 42123493 is about 347.9430176001.
The spelling of 42123493 in words is "forty-two million, one hundred twenty-three thousand, four hundred ninety-three".