42129989 has 8 divisors (see below), whose sum is σ = 46542720. Its totient is φ = 37814400.

The previous prime is 42129959. The next prime is 42130009. The reversal of 42129989 is 98992124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42129989 - 2⁸ = 42129733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42129929) 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 in 7 ways as a sum of consecutive naturals, for example, 23372 + ... + 25109.

It is an arithmetic number, because the mean of its divisors is an integer number (5817840).

Almost surely, 2^42129989 is an apocalyptic number.

It is an amenable number.

42129989 is a deficient number, since it is larger than the sum of its proper divisors (4412731).

42129989 is a wasteful number, since it uses less digits than its factorization.

42129989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48571.

The product of its digits is 93312, while the sum is 44.

The square root of 42129989 is about 6490.7618196942. The cubic root of 42129989 is about 347.9609024865.

It can be divided in two parts, 42 and 129989, that added together give a palindrome (130031).

The spelling of 42129989 in words is "forty-two million, one hundred twenty-nine thousand, nine hundred eighty-nine".