42125639 has 2 divisors, whose sum is σ = 42125640. Its totient is φ = 42125638.

The previous prime is 42125597. The next prime is 42125651. The reversal of 42125639 is 93652124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42125639 - 2¹⁶ = 42060103 is a prime.

It is a super-2 number, since 2×42125639² = 3549138922316642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42125659) 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, 21062819 + 21062820.

It is an arithmetic number, because the mean of its divisors is an integer number (21062820).

Almost surely, 2^42125639 is an apocalyptic number.

42125639 is a deficient number, since it is larger than the sum of its proper divisors (1).

42125639 is an equidigital number, since it uses as much as digits as its factorization.

42125639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 42125639 is about 6490.4267194076. The cubic root of 42125639 is about 347.9489262034.

The spelling of 42125639 in words is "forty-two million, one hundred twenty-five thousand, six hundred thirty-nine".