129249939 has 16 divisors (see below), whose sum is σ = 212102912. Its totient is φ = 68175648.

The previous prime is 129249937. The next prime is 129249979. The reversal of 129249939 is 939942921.

It is not a de Polignac number, because 129249939 - 2¹ = 129249937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129249937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236449 + ... + 236994.

It is an arithmetic number, because the mean of its divisors is an integer number (13256432).

Almost surely, 2^129249939 is an apocalyptic number.

129249939 is a deficient number, since it is larger than the sum of its proper divisors (82852973).

129249939 is a wasteful number, since it uses less digits than its factorization.

129249939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473466.

The product of its digits is 314928, while the sum is 48.

The square root of 129249939 is about 11368.8143181248. The cubic root of 129249939 is about 505.6035511617.

The spelling of 129249939 in words is "one hundred twenty-nine million, two hundred forty-nine thousand, nine hundred thirty-nine".