42158443 has 2 divisors, whose sum is σ = 42158444. Its totient is φ = 42158442.

The previous prime is 42158423. The next prime is 42158491. The reversal of 42158443 is 34485124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42158443 is a prime.

It is not a weakly prime, because it can be changed into another prime (42158423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21079221 + 21079222.

It is an arithmetic number, because the mean of its divisors is an integer number (21079222).

Almost surely, 2^42158443 is an apocalyptic number.

42158443 is a deficient number, since it is larger than the sum of its proper divisors (1).

42158443 is an equidigital number, since it uses as much as digits as its factorization.

42158443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 31.

The square root of 42158443 is about 6492.9533341924. The cubic root of 42158443 is about 348.0392208184.

The spelling of 42158443 in words is "forty-two million, one hundred fifty-eight thousand, four hundred forty-three".