42630139 has 2 divisors, whose sum is σ = 42630140. Its totient is φ = 42630138.

The previous prime is 42630127. The next prime is 42630143. The reversal of 42630139 is 93103624.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42630139 - 2⁷ = 42630011 is a prime.

It is not a weakly prime, because it can be changed into another prime (42630439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21315069 + 21315070.

It is an arithmetic number, because the mean of its divisors is an integer number (21315070).

Almost surely, 2^42630139 is an apocalyptic number.

42630139 is a deficient number, since it is larger than the sum of its proper divisors (1).

42630139 is an equidigital number, since it uses as much as digits as its factorization.

42630139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 42630139 is about 6529.1759816994. The cubic root of 42630139 is about 349.3324391241.

The spelling of 42630139 in words is "forty-two million, six hundred thirty thousand, one hundred thirty-nine".