129878859 has 12 divisors (see below), whose sum is σ = 190346408. Its totient is φ = 78714240.

The previous prime is 129878839. The next prime is 129878863. The reversal of 129878859 is 958878921.

It is not a de Polignac number, because 129878859 - 2¹¹ = 129876811 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129878799 and 129878808.

It is not an unprimeable number, because it can be changed into a prime (129878839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 178534 + ... + 179259.

Almost surely, 2^129878859 is an apocalyptic number.

129878859 is a deficient number, since it is larger than the sum of its proper divisors (60467549).

129878859 is a wasteful number, since it uses less digits than its factorization.

129878859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357818 (or 357807 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 57.

The square root of 129878859 is about 11396.4406285471. The cubic root of 129878859 is about 506.4223002603.

The spelling of 129878859 in words is "one hundred twenty-nine million, eight hundred seventy-eight thousand, eight hundred fifty-nine".