129898438 has 8 divisors (see below), whose sum is σ = 195051240. Its totient is φ = 64881360.

The previous prime is 129898367. The next prime is 129898487. The reversal of 129898438 is 834898921.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31503 + ... + 35386.

It is an arithmetic number, because the mean of its divisors is an integer number (24381405).

Almost surely, 2^129898438 is an apocalyptic number.

129898438 is a deficient number, since it is larger than the sum of its proper divisors (65152802).

129898438 is an equidigital number, since it uses as much as digits as its factorization.

129898438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67862.

The product of its digits is 995328, while the sum is 52.

The square root of 129898438 is about 11397.2995924473. The cubic root of 129898438 is about 506.4477463930.

The spelling of 129898438 in words is "one hundred twenty-nine million, eight hundred ninety-eight thousand, four hundred thirty-eight".