129281376 has 48 divisors (see below), whose sum is σ = 387846144. Its totient is φ = 36937344.

The previous prime is 129281357. The next prime is 129281393. The reversal of 129281376 is 673182921.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95520 + ... + 96863.

It is an arithmetic number, because the mean of its divisors is an integer number (8080128).

Almost surely, 2^129281376 is an apocalyptic number.

129281376 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129281376 is an abundant number, since it is smaller than the sum of its proper divisors (258564768).

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

129281376 is a wasteful number, since it uses less digits than its factorization.

129281376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192403 (or 192395 counting only the distinct ones).

The product of its digits is 36288, while the sum is 39.

The square root of 129281376 is about 11370.1968320694. The cubic root of 129281376 is about 505.6445398860.

The spelling of 129281376 in words is "one hundred twenty-nine million, two hundred eighty-one thousand, three hundred seventy-six".