129974389236 has 96 divisors (see below), whose sum is σ = 356949936000. Its totient is φ = 40758280704.

The previous prime is 129974389217. The next prime is 129974389277. The reversal of 129974389236 is 632983479921.

129974389236 is a `hidden beast` number, since 1 + 29 + 97 + 438 + 92 + 3 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4500330 + ... + 4529118.

It is an arithmetic number, because the mean of its divisors is an integer number (3718228500).

Almost surely, 2^129974389236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129974389236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178474968000).

129974389236 is an abundant number, since it is smaller than the sum of its proper divisors (226975546764).

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

129974389236 is a wasteful number, since it uses less digits than its factorization.

129974389236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31278 (or 31270 counting only the distinct ones).

The product of its digits is 35271936, while the sum is 63.

The spelling of 129974389236 in words is "one hundred twenty-nine billion, nine hundred seventy-four million, three hundred eighty-nine thousand, two hundred thirty-six".