42156347 has 2 divisors, whose sum is σ = 42156348. Its totient is φ = 42156346.

The previous prime is 42156313. The next prime is 42156349. The reversal of 42156347 is 74365124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42156347 - 2⁸ = 42156091 is a prime.

Together with 42156349, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42156349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078173 + 21078174.

It is an arithmetic number, because the mean of its divisors is an integer number (21078174).

Almost surely, 2^42156347 is an apocalyptic number.

42156347 is a deficient number, since it is larger than the sum of its proper divisors (1).

42156347 is an equidigital number, since it uses as much as digits as its factorization.

42156347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 32.

The square root of 42156347 is about 6492.7919264366. The cubic root of 42156347 is about 348.0334528769.

The spelling of 42156347 in words is "forty-two million, one hundred fifty-six thousand, three hundred forty-seven".