129749233 has 8 divisors (see below), whose sum is σ = 142516800. Its totient is φ = 117575568.

The previous prime is 129749231. The next prime is 129749261. The reversal of 129749233 is 332947921.

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 129749233 - 2¹ = 129749231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129749231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148018 + ... + 148891.

It is an arithmetic number, because the mean of its divisors is an integer number (17814600).

Almost surely, 2^129749233 is an apocalyptic number.

It is an amenable number.

129749233 is a deficient number, since it is larger than the sum of its proper divisors (12767567).

129749233 is a wasteful number, since it uses less digits than its factorization.

129749233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296951.

The product of its digits is 81648, while the sum is 40.

The square root of 129749233 is about 11390.7520822815. The cubic root of 129749233 is about 506.2537653939.

The spelling of 129749233 in words is "one hundred twenty-nine million, seven hundred forty-nine thousand, two hundred thirty-three".