129173376 has 64 divisors (see below), whose sum is σ = 351141120. Its totient is φ = 42051072.

The previous prime is 129173371. The next prime is 129173389. The reversal of 129173376 is 673371921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×129173376² = 33371522134474752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129173371) 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, 12601 + ... + 20423.

It is an arithmetic number, because the mean of its divisors is an integer number (5486580).

Almost surely, 2^129173376 is an apocalyptic number.

129173376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129173376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175570560).

129173376 is an abundant number, since it is smaller than the sum of its proper divisors (221967744).

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

129173376 is an equidigital number, since it uses as much as digits as its factorization.

129173376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7883 (or 7871 counting only the distinct ones).

The product of its digits is 47628, while the sum is 39.

The square root of 129173376 is about 11365.4465816351. The cubic root of 129173376 is about 505.5036976761.

The spelling of 129173376 in words is "one hundred twenty-nine million, one hundred seventy-three thousand, three hundred seventy-six".