129189489 has 16 divisors (see below), whose sum is σ = 202367424. Its totient is φ = 72273600.

The previous prime is 129189481. The next prime is 129189499. The reversal of 129189489 is 984981921.

It is not a de Polignac number, because 129189489 - 2³ = 129189481 is a prime.

It is a super-2 number, since 2×129189489² = 33379848136162242, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (129189481) 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, 150142 + ... + 150999.

It is an arithmetic number, because the mean of its divisors is an integer number (12647964).

Almost surely, 2^129189489 is an apocalyptic number.

It is an amenable number.

129189489 is a deficient number, since it is larger than the sum of its proper divisors (73177935).

129189489 is a wasteful number, since it uses less digits than its factorization.

129189489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301168.

The product of its digits is 373248, while the sum is 51.

The square root of 129189489 is about 11366.1554186101. The cubic root of 129189489 is about 505.5247155325.

The spelling of 129189489 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, four hundred eighty-nine".