129220084 has 12 divisors (see below), whose sum is σ = 258440224. Its totient is φ = 55380024.

The previous prime is 129220081. The next prime is 129220097. The reversal of 129220084 is 480022921.

129220084 is an admirable number.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 4615003 = 129220084 / (1 + 2 + 9 + 2 + 2 + 0 + 0 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129220081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2307474 + ... + 2307529.

Almost surely, 2^129220084 is an apocalyptic number.

129220084 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

129220084 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129220084 is a wasteful number, since it uses less digits than its factorization.

129220084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4615014 (or 4615012 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 129220084 is about 11367.5012205849. The cubic root of 129220084 is about 505.5646189540.

The spelling of 129220084 in words is "one hundred twenty-nine million, two hundred twenty thousand, eighty-four".