42139129 has 4 divisors (see below), whose sum is σ = 42152320. Its totient is φ = 42125940.

The previous prime is 42139121. The next prime is 42139133. The reversal of 42139129 is 92193124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 42139129 - 2³ = 42139121 is a prime.

It is a super-3 number, since 3×42139129³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42139129.

It is not an unprimeable number, because it can be changed into a prime (42139121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1552 + ... + 9310.

It is an arithmetic number, because the mean of its divisors is an integer number (10538080).

Almost surely, 2^42139129 is an apocalyptic number.

It is an amenable number.

42139129 is a deficient number, since it is larger than the sum of its proper divisors (13191).

42139129 is an equidigital number, since it uses as much as digits as its factorization.

42139129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13190.

The product of its digits is 3888, while the sum is 31.

The square root of 42139129 is about 6491.4658591107. The cubic root of 42139129 is about 347.9860637613.

The spelling of 42139129 in words is "forty-two million, one hundred thirty-nine thousand, one hundred twenty-nine".