129799642 has 8 divisors (see below), whose sum is σ = 222513696. Its totient is φ = 55628412.

The previous prime is 129799619. The next prime is 129799661. The reversal of 129799642 is 246997921.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 4635688 + ... + 4635715.

It is an arithmetic number, because the mean of its divisors is an integer number (27814212).

Almost surely, 2^129799642 is an apocalyptic number.

129799642 is a deficient number, since it is larger than the sum of its proper divisors (92714054).

129799642 is an equidigital number, since it uses as much as digits as its factorization.

129799642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9271412.

The product of its digits is 489888, while the sum is 49.

The square root of 129799642 is about 11392.9645834611. The cubic root of 129799642 is about 506.3193186186.

The spelling of 129799642 in words is "one hundred twenty-nine million, seven hundred ninety-nine thousand, six hundred forty-two".