129043889 has 8 divisors (see below), whose sum is σ = 147145320. Its totient is φ = 112110336.

The previous prime is 129043883. The next prime is 129043891. The reversal of 129043889 is 988340921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37210000 + 91833889 = 6100^2 + 9583^2 .

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

It is not a de Polignac number, because 129043889 - 2²⁴ = 112266673 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 (129043883) 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, 291734 + ... + 292175.

It is an arithmetic number, because the mean of its divisors is an integer number (18393165).

Almost surely, 2^129043889 is an apocalyptic number.

It is an amenable number.

129043889 is a deficient number, since it is larger than the sum of its proper divisors (18101431).

129043889 is a wasteful number, since it uses less digits than its factorization.

129043889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583939.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 129043889 is about 11359.7486327823. The cubic root of 129043889 is about 505.3347308626.

The spelling of 129043889 in words is "one hundred twenty-nine million, forty-three thousand, eight hundred eighty-nine".