129638 has 8 divisors (see below), whose sum is σ = 198288. Its totient is φ = 63544.

The previous prime is 129631. The next prime is 129641. The reversal of 129638 is 836921.

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

It is a super-2 number, since 2×129638² = 33612022088, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 129638.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129638.

It is not an unprimeable number, because it can be changed into a prime (129631) by changing a digit.

129638 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (24786).

2¹²⁹⁶³⁸ is an apocalyptic number.

129638 is a deficient number, since it is larger than the sum of its proper divisors (68650).

129638 is a wasteful number, since it uses less digits than its factorization.

129638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its digits is 2592, while the sum is 29.

The square root of 129638 is about 360.0527739096. The cubic root of 129638 is about 50.6109054905.

It can be divided in two parts, 129 and 638, that added together give a palindrome (767).

The spelling of 129638 in words is "one hundred twenty-nine thousand, six hundred thirty-eight".