129971946 has 16 divisors (see below), whose sum is σ = 279939744. Its totient is φ = 39991344.

The previous prime is 129971917. The next prime is 129971957. The reversal of 129971946 is 649179921.

It is a junction number, because it is equal to n+sod(n) for n = 129971895 and 129971904.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 833076 + ... + 833231.

It is an arithmetic number, because the mean of its divisors is an integer number (17496234).

Almost surely, 2^129971946 is an apocalyptic number.

129971946 is an abundant number, since it is smaller than the sum of its proper divisors (149967798).

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

129971946 is a wasteful number, since it uses less digits than its factorization.

129971946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666325.

The product of its digits is 244944, while the sum is 48.

The square root of 129971946 is about 11400.5239353286. The cubic root of 129971946 is about 506.5432593220.

The spelling of 129971946 in words is "one hundred twenty-nine million, nine hundred seventy-one thousand, nine hundred forty-six".