42139259 has 2 divisors, whose sum is σ = 42139260. Its totient is φ = 42139258.

The previous prime is 42139231. The next prime is 42139309. The reversal of 42139259 is 95293124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42139259 - 2⁸ = 42139003 is a prime.

It is not a weakly prime, because it can be changed into another prime (42139219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21069629 + 21069630.

It is an arithmetic number, because the mean of its divisors is an integer number (21069630).

Almost surely, 2^42139259 is an apocalyptic number.

42139259 is a deficient number, since it is larger than the sum of its proper divisors (1).

42139259 is an equidigital number, since it uses as much as digits as its factorization.

42139259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 35.

The square root of 42139259 is about 6491.4758722497. The cubic root of 42139259 is about 347.9864216087.

The spelling of 42139259 in words is "forty-two million, one hundred thirty-nine thousand, two hundred fifty-nine".