129157470 has 128 divisors (see below), whose sum is σ = 383201280. Its totient is φ = 30741120.

The previous prime is 129157433. The next prime is 129157471. The reversal of 129157470 is 74751921.

It is a happy number.

129157470 is a `hidden beast` number, since 12 + 9 + 1 + 574 + 70 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129157471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 108217 + ... + 109403.

It is an arithmetic number, because the mean of its divisors is an integer number (2993760).

Almost surely, 2^129157470 is an apocalyptic number.

129157470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129157470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191600640).

129157470 is an abundant number, since it is smaller than the sum of its proper divisors (254043810).

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

129157470 is a wasteful number, since it uses less digits than its factorization.

129157470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247 (or 1241 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 129157470 is about 11364.7468075624. The cubic root of 129157470 is about 505.4829481168.

The spelling of 129157470 in words is "one hundred twenty-nine million, one hundred fifty-seven thousand, four hundred seventy".