129977806 has 8 divisors (see below), whose sum is σ = 222819120. Its totient is φ = 55704768.

The previous prime is 129977779. The next prime is 129977819. The reversal of 129977806 is 608779921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 129977806.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 4642051 + ... + 4642078.

It is an arithmetic number, because the mean of its divisors is an integer number (27852390).

Almost surely, 2^129977806 is an apocalyptic number.

129977806 is a deficient number, since it is larger than the sum of its proper divisors (92841314).

129977806 is an equidigital number, since it uses as much as digits as its factorization.

129977806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9284138.

The product of its (nonzero) digits is 381024, while the sum is 49.

The square root of 129977806 is about 11400.7809381638. The cubic root of 129977806 is about 506.5508719876.

The spelling of 129977806 in words is "one hundred twenty-nine million, nine hundred seventy-seven thousand, eight hundred six".