42239129939 has 2 divisors, whose sum is σ = 42239129940. Its totient is φ = 42239129938.

The previous prime is 42239129923. The next prime is 42239130013. The reversal of 42239129939 is 93992193224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42239129939 - 2⁴ = 42239129923 is a prime.

It is a super-2 number, since 2×42239129939² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42230129939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21119564969 + 21119564970.

It is an arithmetic number, because the mean of its divisors is an integer number (21119564970).

Almost surely, 2^42239129939 is an apocalyptic number.

42239129939 is a deficient number, since it is larger than the sum of its proper divisors (1).

42239129939 is an equidigital number, since it uses as much as digits as its factorization.

42239129939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 53.

The spelling of 42239129939 in words is "forty-two billion, two hundred thirty-nine million, one hundred twenty-nine thousand, nine hundred thirty-nine".