129197040 has 160 divisors (see below), whose sum is σ = 466684416. Its totient is φ = 28953600.

The previous prime is 129197039. The next prime is 129197041. The reversal of 129197040 is 40791921.

It is an interprime number because it is at equal distance from previous prime (129197039) and next prime (129197041).

It is a junction number, because it is equal to n+sod(n) for n = 129196992 and 129197010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129197041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88315 + ... + 89765.

Almost surely, 2^129197040 is an apocalyptic number.

129197040 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 129197040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (233342208).

129197040 is an abundant number, since it is smaller than the sum of its proper divisors (337487376).

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

129197040 is a wasteful number, since it uses less digits than its factorization.

129197040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1527 (or 1521 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 129197040 is about 11366.4875841220. The cubic root of 129197040 is about 505.5345644833.

The spelling of 129197040 in words is "one hundred twenty-nine million, one hundred ninety-seven thousand, forty".