129973892 has 12 divisors (see below), whose sum is σ = 228981900. Its totient is φ = 64550496.

The previous prime is 129973849. The next prime is 129973901. The reversal of 129973892 is 298379921.

It can be written as a sum of positive squares in 2 ways, for example, as 63616576 + 66357316 = 7976^2 + 8146^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129973892.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108443 + ... + 109634.

It is an arithmetic number, because the mean of its divisors is an integer number (19081825).

Almost surely, 2^129973892 is an apocalyptic number.

It is an amenable number.

129973892 is a deficient number, since it is larger than the sum of its proper divisors (99008008).

129973892 is a wasteful number, since it uses less digits than its factorization.

129973892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218230 (or 218228 counting only the distinct ones).

The product of its digits is 489888, while the sum is 50.

The square root of 129973892 is about 11400.6092819638. The cubic root of 129973892 is about 506.5457873759.

The spelling of 129973892 in words is "one hundred twenty-nine million, nine hundred seventy-three thousand, eight hundred ninety-two".