129478089 has 8 divisors (see below), whose sum is σ = 185917312. Its totient is φ = 79678800.

The previous prime is 129478073. The next prime is 129478093. The reversal of 129478089 is 980874921.

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

It is not a de Polignac number, because 129478089 - 2⁴ = 129478073 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129478009) 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, 1659937 + ... + 1660014.

It is an arithmetic number, because the mean of its divisors is an integer number (23239664).

Almost surely, 2^129478089 is an apocalyptic number.

It is an amenable number.

129478089 is a deficient number, since it is larger than the sum of its proper divisors (56439223).

129478089 is a wasteful number, since it uses less digits than its factorization.

129478089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319967.

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 129478089 is about 11378.8439219457. The cubic root of 129478089 is about 505.9008708205.

The spelling of 129478089 in words is "one hundred twenty-nine million, four hundred seventy-eight thousand, eighty-nine".