42810139 has 2 divisors, whose sum is σ = 42810140. Its totient is φ = 42810138.

The previous prime is 42810137. The next prime is 42810143. The reversal of 42810139 is 93101824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42810139 - 2¹ = 42810137 is a prime.

Together with 42810137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (42810137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21405069 + 21405070.

It is an arithmetic number, because the mean of its divisors is an integer number (21405070).

Almost surely, 2^42810139 is an apocalyptic number.

42810139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42810139 is an equidigital number, since it uses as much as digits as its factorization.

42810139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 42810139 is about 6542.9457433178. The cubic root of 42810139 is about 349.8234184092.

The spelling of 42810139 in words is "forty-two million, eight hundred ten thousand, one hundred thirty-nine".