129638371 has 8 divisors (see below), whose sum is σ = 132300864. Its totient is φ = 126984000.

The previous prime is 129638357. The next prime is 129638389. The reversal of 129638371 is 173836921.

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 129638371 - 2⁵ = 129638339 is a prime.

It is a super-2 number, since 2×129638371² = 33612214471067282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129638321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38175 + ... + 41431.

It is an arithmetic number, because the mean of its divisors is an integer number (16537608).

Almost surely, 2^129638371 is an apocalyptic number.

129638371 is a deficient number, since it is larger than the sum of its proper divisors (2662493).

129638371 is an equidigital number, since it uses as much as digits as its factorization.

129638371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061.

The product of its digits is 54432, while the sum is 40.

The square root of 129638371 is about 11385.8847262740. The cubic root of 129638371 is about 506.1095377017.

The spelling of 129638371 in words is "one hundred twenty-nine million, six hundred thirty-eight thousand, three hundred seventy-one".