129138214860 has 144 divisors (see below), whose sum is σ = 415466827776. Its totient is φ = 32356048896.

The previous prime is 129138214841. The next prime is 129138214879. The reversal of 129138214860 is 68412831921.

129138214860 is a `hidden beast` number, since 1 + 2 + 91 + 3 + 82 + 1 + 486 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (129138214841) and next prime (129138214879).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 1778997 + ... + 1850163.

It is an arithmetic number, because the mean of its divisors is an integer number (2885186304).

Almost surely, 2^129138214860 is an apocalyptic number.

129138214860 is a gapful number since it is divisible by the number (10) 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 129138214860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207733413888).

129138214860 is an abundant number, since it is smaller than the sum of its proper divisors (286328612916).

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

129138214860 is a wasteful number, since it uses less digits than its factorization.

129138214860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71792 (or 71787 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 129138214860 in words is "one hundred twenty-nine billion, one hundred thirty-eight million, two hundred fourteen thousand, eight hundred sixty".