129997887 has 8 divisors (see below), whose sum is σ = 173971200. Its totient is φ = 86344920.

The previous prime is 129997877. The next prime is 129997891. The reversal of 129997887 is 788799921.

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

It is not a de Polignac number, because 129997887 - 2¹² = 129993791 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129997887.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129997877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79137 + ... + 80762.

It is an arithmetic number, because the mean of its divisors is an integer number (21746400).

Almost surely, 2^129997887 is an apocalyptic number.

129997887 is a deficient number, since it is larger than the sum of its proper divisors (43973313).

129997887 is a wasteful number, since it uses less digits than its factorization.

129997887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160173.

The product of its digits is 4572288, while the sum is 60.

The square root of 129997887 is about 11401.6615894351. The cubic root of 129997887 is about 506.5769572724.

The spelling of 129997887 in words is "one hundred twenty-nine million, nine hundred ninety-seven thousand, eight hundred eighty-seven".