129109394 has 8 divisors (see below), whose sum is σ = 194964300. Its totient is φ = 64121296.

The previous prime is 129109361. The next prime is 129109417. The reversal of 129109394 is 493901921.

It can be written as a sum of positive squares in 2 ways, for example, as 126270169 + 2839225 = 11237^2 + 1685^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216329 + ... + 216924.

Almost surely, 2^129109394 is an apocalyptic number.

129109394 is a deficient number, since it is larger than the sum of its proper divisors (65854906).

129109394 is a wasteful number, since it uses less digits than its factorization.

129109394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433404.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 129109394 is about 11362.6314733868. The cubic root of 129109394 is about 505.4202220660.

The spelling of 129109394 in words is "one hundred twenty-nine million, one hundred nine thousand, three hundred ninety-four".