129959442 has 18 divisors (see below), whose sum is σ = 281683623. Its totient is φ = 43303692.

The previous prime is 129959437. The next prime is 129959443. The reversal of 129959442 is 244959921.

129959442 is a `hidden beast` number, since 12 + 9 + 9 + 594 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64979721 + 64979721 = 8061^2 + 8061^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=8061.

It is not an unprimeable number, because it can be changed into a prime (129959443) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 47023 + ... + 49709.

Almost surely, 2^129959442 is an apocalyptic number.

129959442 is an abundant number, since it is smaller than the sum of its proper divisors (151724181).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129959442 is an frugal number, since it uses more digits than its factorization.

129959442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5382 (or 2692 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 129959442 is about 11399.9755262895. The cubic root of 129959442 is about 506.5270147394.

The spelling of 129959442 in words is "one hundred twenty-nine million, nine hundred fifty-nine thousand, four hundred forty-two".