42129739 has 2 divisors, whose sum is σ = 42129740. Its totient is φ = 42129738.

The previous prime is 42129733. The next prime is 42129749. The reversal of 42129739 is 93792124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42129739 - 2¹⁹ = 41605451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 42129698 and 42129707.

It is not a weakly prime, because it can be changed into another prime (42129733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21064869 + 21064870.

It is an arithmetic number, because the mean of its divisors is an integer number (21064870).

Almost surely, 2^42129739 is an apocalyptic number.

42129739 is a deficient number, since it is larger than the sum of its proper divisors (1).

42129739 is an equidigital number, since it uses as much as digits as its factorization.

42129739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 42129739 is about 6490.7425615256. The cubic root of 42129739 is about 347.9602142167.

The spelling of 42129739 in words is "forty-two million, one hundred twenty-nine thousand, seven hundred thirty-nine".