129312612 has 120 divisors (see below), whose sum is σ = 397290432. Its totient is φ = 36158400.

The previous prime is 129312611. The next prime is 129312649. The reversal of 129312612 is 216213921.

129312612 is a `hidden beast` number, since 12 + 9 + 31 + 2 + 612 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (129312611) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 44937 + ... + 47727.

Almost surely, 2^129312612 is an apocalyptic number.

129312612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129312612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198645216).

129312612 is an abundant number, since it is smaller than the sum of its proper divisors (267977820).

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

129312612 is a wasteful number, since it uses less digits than its factorization.

129312612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831 (or 2820 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 129312612 is about 11371.5703401069. The cubic root of 129312612 is about 505.6852599584.

The spelling of 129312612 in words is "one hundred twenty-nine million, three hundred twelve thousand, six hundred twelve".