129878223 has 16 divisors (see below), whose sum is σ = 175440000. Its totient is φ = 85456800.

The previous prime is 129878213. The next prime is 129878239. The reversal of 129878223 is 322878921.

It is a happy number.

It is not a de Polignac number, because 129878223 - 2⁵ = 129878191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129878213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 150768 + ... + 151626.

It is an arithmetic number, because the mean of its divisors is an integer number (10965000).

Almost surely, 2^129878223 is an apocalyptic number.

129878223 is a deficient number, since it is larger than the sum of its proper divisors (45561777).

129878223 is a wasteful number, since it uses less digits than its factorization.

129878223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1462.

The product of its digits is 96768, while the sum is 42.

The square root of 129878223 is about 11396.4127250640. The cubic root of 129878223 is about 506.4214736308.

The spelling of 129878223 in words is "one hundred twenty-nine million, eight hundred seventy-eight thousand, two hundred twenty-three".