129947286 has 128 divisors (see below), whose sum is σ = 337913856. Its totient is φ = 32440320.

The previous prime is 129947281. The next prime is 129947287. The reversal of 129947286 is 682749921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129947281) 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, 673206 + ... + 673398.

It is an arithmetic number, because the mean of its divisors is an integer number (2639952).

Almost surely, 2^129947286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129947286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168956928).

129947286 is an abundant number, since it is smaller than the sum of its proper divisors (207966570).

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

129947286 is a wasteful number, since it uses less digits than its factorization.

129947286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286.

The product of its digits is 435456, while the sum is 48.

The square root of 129947286 is about 11399.4423547821. The cubic root of 129947286 is about 506.5112212623.

The spelling of 129947286 in words is "one hundred twenty-nine million, nine hundred forty-seven thousand, two hundred eighty-six".