129867840 has 112 divisors (see below), whose sum is σ = 458175360. Its totient is φ = 34629120.

The previous prime is 129867823. The next prime is 129867847. The reversal of 129867840 is 48768921.

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

It is not an unprimeable number, because it can be changed into a prime (129867847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1125 + ... + 16155.

Almost surely, 2^129867840 is an apocalyptic number.

129867840 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 129867840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (229087680).

129867840 is an abundant number, since it is smaller than the sum of its proper divisors (328307520).

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

129867840 is a wasteful number, since it uses less digits than its factorization.

129867840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15057 (or 15041 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 129867840 is about 11395.9571778767. The cubic root of 129867840 is about 506.4079781318.

The spelling of 129867840 in words is "one hundred twenty-nine million, eight hundred sixty-seven thousand, eight hundred forty".