129261384 has 48 divisors (see below), whose sum is σ = 400096320. Its totient is φ = 36931680.

The previous prime is 129261383. The next prime is 129261401. The reversal of 129261384 is 483162921.

129261384 is a `hidden beast` number, since 12 + 9 + 261 + 384 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (129261383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127732 + ... + 128739.

It is an arithmetic number, because the mean of its divisors is an integer number (8335340).

Almost surely, 2^129261384 is an apocalyptic number.

129261384 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129261384 is an abundant number, since it is smaller than the sum of its proper divisors (270834936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129261384 is a wasteful number, since it uses less digits than its factorization.

129261384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256490 (or 256483 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 129261384 is about 11369.3176576257. The cubic root of 129261384 is about 505.6184743456.

The spelling of 129261384 in words is "one hundred twenty-nine million, two hundred sixty-one thousand, three hundred eighty-four".