129889242 has 24 divisors (see below), whose sum is σ = 321630816. Its totient is φ = 37111176.

The previous prime is 129889229. The next prime is 129889259. The reversal of 129889242 is 242988921.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 515308 + ... + 515559.

It is an arithmetic number, because the mean of its divisors is an integer number (13401284).

Almost surely, 2^129889242 is an apocalyptic number.

129889242 is an abundant number, since it is smaller than the sum of its proper divisors (191741574).

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

129889242 is a wasteful number, since it uses less digits than its factorization.

129889242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030882 (or 1030879 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 129889242 is about 11396.8961564103. The cubic root of 129889242 is about 506.4357949960.

The spelling of 129889242 in words is "one hundred twenty-nine million, eight hundred eighty-nine thousand, two hundred forty-two".