129399846408 has 864 divisors, whose sum is σ = 461018900160. Its totient is φ = 33880654080.

The previous prime is 129399846391. The next prime is 129399846409. The reversal of 129399846408 is 804648993921.

129399846408 is a `hidden beast` number, since 12 + 93 + 9 + 98 + 46 + 408 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (129399846409) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1822533013 + ... + 1822533083.

It is an arithmetic number, because the mean of its divisors is an integer number (533586690).

Almost surely, 2^129399846408 is an apocalyptic number.

129399846408 is a gapful number since it is divisible by the number (18) 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 129399846408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230509450080).

129399846408 is an abundant number, since it is smaller than the sum of its proper divisors (331619053752).

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

129399846408 is a wasteful number, since it uses less digits than its factorization.

129399846408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 63.

The spelling of 129399846408 in words is "one hundred twenty-nine billion, three hundred ninety-nine million, eight hundred forty-six thousand, four hundred eight".