129212788 has 24 divisors (see below), whose sum is σ = 228981312. Its totient is φ = 63794304.

The previous prime is 129212753. The next prime is 129212819. The reversal of 129212788 is 887212921.

It is a self number, because there is not a number n which added to its sum of digits gives 129212788.

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, 219831 + ... + 220417.

It is an arithmetic number, because the mean of its divisors is an integer number (9540888).

Almost surely, 2^129212788 is an apocalyptic number.

It is an amenable number.

129212788 is a deficient number, since it is larger than the sum of its proper divisors (99768524).

129212788 is a wasteful number, since it uses less digits than its factorization.

129212788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191 (or 1189 counting only the distinct ones).

The product of its digits is 32256, while the sum is 40.

The square root of 129212788 is about 11367.1803012005. The cubic root of 129212788 is about 505.5551037436. Note that the first 3 decimals are identical.

The spelling of 129212788 in words is "one hundred twenty-nine million, two hundred twelve thousand, seven hundred eighty-eight".