129979116 has 18 divisors (see below), whose sum is σ = 328558412. Its totient is φ = 43326360.

The previous prime is 129979081. The next prime is 129979123. The reversal of 129979116 is 611979921.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×129979116² = 33789141192282912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1805230 + ... + 1805301.

Almost surely, 2^129979116 is an apocalyptic number.

It is an amenable number.

129979116 is an abundant number, since it is smaller than the sum of its proper divisors (198579296).

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

129979116 is a wasteful number, since it uses less digits than its factorization.

129979116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3610541 (or 3610536 counting only the distinct ones).

The product of its digits is 61236, while the sum is 45.

The square root of 129979116 is about 11400.8383902238. The cubic root of 129979116 is about 506.5525737638.

The spelling of 129979116 in words is "one hundred twenty-nine million, nine hundred seventy-nine thousand, one hundred sixteen".