42123239 has 2 divisors, whose sum is σ = 42123240. Its totient is φ = 42123238.

The previous prime is 42123217. The next prime is 42123259. The reversal of 42123239 is 93232124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42123239 is a prime.

It is a super-2 number, since 2×42123239² = 3548734527702242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42123259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21061619 + 21061620.

It is an arithmetic number, because the mean of its divisors is an integer number (21061620).

Almost surely, 2^42123239 is an apocalyptic number.

42123239 is a deficient number, since it is larger than the sum of its proper divisors (1).

42123239 is an equidigital number, since it uses as much as digits as its factorization.

42123239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 42123239 is about 6490.2418290846. The cubic root of 42123239 is about 347.9423182461.

The spelling of 42123239 in words is "forty-two million, one hundred twenty-three thousand, two hundred thirty-nine".