129189477 has 8 divisors (see below), whose sum is σ = 182385216. Its totient is φ = 81060032.

The previous prime is 129189457. The next prime is 129189481. The reversal of 129189477 is 774981921.

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

It is a cyclic number.

It is not a de Polignac number, because 129189477 - 2⁷ = 129189349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129189457) 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, 1266513 + ... + 1266614.

It is an arithmetic number, because the mean of its divisors is an integer number (22798152).

Almost surely, 2^129189477 is an apocalyptic number.

129189477 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129189477 is a deficient number, since it is larger than the sum of its proper divisors (53195739).

129189477 is a wasteful number, since it uses less digits than its factorization.

129189477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2533147.

The product of its digits is 254016, while the sum is 48.

The square root of 129189477 is about 11366.1548907271. The cubic root of 129189477 is about 505.5246998803.

The spelling of 129189477 in words is "one hundred twenty-nine million, one hundred eighty-nine thousand, four hundred seventy-seven".