129873216 has 56 divisors (see below), whose sum is σ = 374867424. Its totient is φ = 39354880.

The previous prime is 129873197. The next prime is 129873221. The reversal of 129873216 is 612378921.

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, 28635 + ... + 32858.

Almost surely, 2^129873216 is an apocalyptic number.

129873216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

129873216 is an abundant number, since it is smaller than the sum of its proper divisors (244994208).

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

129873216 is a wasteful number, since it uses less digits than its factorization.

129873216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61519 (or 61509 counting only the distinct ones).

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

The square root of 129873216 is about 11396.1930485579. The cubic root of 129873216 is about 506.4149657784.

The spelling of 129873216 in words is "one hundred twenty-nine million, eight hundred seventy-three thousand, two hundred sixteen".