42877139 has 2 divisors, whose sum is σ = 42877140. Its totient is φ = 42877138.

The previous prime is 42877097. The next prime is 42877141. The reversal of 42877139 is 93177824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42877139 - 2¹² = 42873043 is a prime.

Together with 42877141, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42877096 and 42877105.

It is not a weakly prime, because it can be changed into another prime (42877189) 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, 21438569 + 21438570.

It is an arithmetic number, because the mean of its divisors is an integer number (21438570).

Almost surely, 2^42877139 is an apocalyptic number.

42877139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42877139 is an equidigital number, since it uses as much as digits as its factorization.

42877139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 42877139 is about 6548.0637596163. The cubic root of 42877139 is about 350.0058203114.

The spelling of 42877139 in words is "forty-two million, eight hundred seventy-seven thousand, one hundred thirty-nine".