42043139 has 2 divisors, whose sum is σ = 42043140. Its totient is φ = 42043138.

The previous prime is 42043117. The next prime is 42043201. The reversal of 42043139 is 93134024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42043139 - 2¹² = 42039043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42043039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21021569 + 21021570.

It is an arithmetic number, because the mean of its divisors is an integer number (21021570).

Almost surely, 2^42043139 is an apocalyptic number.

42043139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42043139 is an equidigital number, since it uses as much as digits as its factorization.

42043139 is an odious number, because the sum of its binary digits is odd.

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

The square root of 42043139 is about 6484.0680903272. The cubic root of 42043139 is about 347.7216335387.

The spelling of 42043139 in words is "forty-two million, forty-three thousand, one hundred thirty-nine".