129379638 has 8 divisors (see below), whose sum is σ = 258759288. Its totient is φ = 43126544.

The previous prime is 129379637. The next prime is 129379681. The reversal of 129379638 is 836973921.

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

129379638 is an admirable number.

It is a super-2 number, since 2×129379638² = 33478181458022088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129379637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10781631 + ... + 10781642.

It is an arithmetic number, because the mean of its divisors is an integer number (32344911).

Almost surely, 2^129379638 is an apocalyptic number.

129379638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129379638 is a wasteful number, since it uses less digits than its factorization.

129379638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21563278.

The product of its digits is 489888, while the sum is 48.

The square root of 129379638 is about 11374.5170446925. The cubic root of 129379638 is about 505.7726146909.

The spelling of 129379638 in words is "one hundred twenty-nine million, three hundred seventy-nine thousand, six hundred thirty-eight".