129891408 has 40 divisors (see below), whose sum is σ = 337793856. Its totient is φ = 43008000.

The previous prime is 129891397. The next prime is 129891449. The reversal of 129891408 is 804198921.

It is a self number, because there is not a number n which added to its sum of digits gives 129891408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1713 + ... + 16208.

Almost surely, 2^129891408 is an apocalyptic number.

It is an amenable number.

129891408 is an abundant number, since it is smaller than the sum of its proper divisors (207902448).

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

129891408 is a wasteful number, since it uses less digits than its factorization.

129891408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18083 (or 18077 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 129891408 is about 11396.9911818866. The cubic root of 129891408 is about 506.4386100453.

The spelling of 129891408 in words is "one hundred twenty-nine million, eight hundred ninety-one thousand, four hundred eight".