42235139 has 2 divisors, whose sum is σ = 42235140. Its totient is φ = 42235138.

The previous prime is 42235133. The next prime is 42235169. The reversal of 42235139 is 93153224.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42235139 is a prime.

It is not a weakly prime, because it can be changed into another prime (42235133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21117569 + 21117570.

It is an arithmetic number, because the mean of its divisors is an integer number (21117570).

Almost surely, 2^42235139 is an apocalyptic number.

42235139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42235139 is an equidigital number, since it uses as much as digits as its factorization.

42235139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 42235139 is about 6498.8567456130. The cubic root of 42235139 is about 348.2501476891.

The spelling of 42235139 in words is "forty-two million, two hundred thirty-five thousand, one hundred thirty-nine".