129784090 has 8 divisors (see below), whose sum is σ = 233611380. Its totient is φ = 51913632.

The previous prime is 129784063. The next prime is 129784097. The reversal of 129784090 is 90487921.

It can be written as a sum of positive squares in 2 ways, for example, as 120802081 + 8982009 = 10991^2 + 2997^2 .

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

It is not an unprimeable number, because it can be changed into a prime (129784097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6489195 + ... + 6489214.

Almost surely, 2^129784090 is an apocalyptic number.

129784090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129784090 is a deficient number, since it is larger than the sum of its proper divisors (103827290).

129784090 is a wasteful number, since it uses less digits than its factorization.

129784090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12978416.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 129784090 is about 11392.2820365368. The cubic root of 129784090 is about 506.2990961885.

The spelling of 129784090 in words is "one hundred twenty-nine million, seven hundred eighty-four thousand, ninety".