129432492 has 168 divisors, whose sum is σ = 412052256. Its totient is φ = 34712064.

The previous prime is 129432473. The next prime is 129432493. The reversal of 129432492 is 294234921.

129432492 is a `hidden beast` number, since 129 + 43 + 2 + 492 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (129432493) by changing a digit.

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 55 ways as a sum of consecutive naturals, for example, 346818 + ... + 347190.

It is an arithmetic number, because the mean of its divisors is an integer number (2452692).

Almost surely, 2^129432492 is an apocalyptic number.

129432492 is a gapful number since it is divisible by the number (12) 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 129432492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206026128).

129432492 is an abundant number, since it is smaller than the sum of its proper divisors (282619764).

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

129432492 is a wasteful number, since it uses less digits than its factorization.

129432492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 402 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 129432492 is about 11376.8401588490. The cubic root of 129432492 is about 505.8414778361.

The spelling of 129432492 in words is "one hundred twenty-nine million, four hundred thirty-two thousand, four hundred ninety-two".