129472842 has 32 divisors (see below), whose sum is σ = 277517952. Its totient is φ = 40163904.

The previous prime is 129472841. The next prime is 129472883. The reversal of 129472842 is 248274921.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 129472842.

It is not an unprimeable number, because it can be changed into a prime (129472841) 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, 7573 + ... + 17784.

It is an arithmetic number, because the mean of its divisors is an integer number (8672436).

Almost surely, 2^129472842 is an apocalyptic number.

129472842 is an abundant number, since it is smaller than the sum of its proper divisors (148045110).

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

129472842 is a wasteful number, since it uses less digits than its factorization.

129472842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25422.

The product of its digits is 64512, while the sum is 39.

The square root of 129472842 is about 11378.6133601595. The cubic root of 129472842 is about 505.8940369803.

The spelling of 129472842 in words is "one hundred twenty-nine million, four hundred seventy-two thousand, eight hundred forty-two".