129644938 has 4 divisors (see below), whose sum is σ = 194467410. Its totient is φ = 64822468.

The previous prime is 129644903. The next prime is 129644971. The reversal of 129644938 is 839446921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 102677689 + 26967249 = 10133^2 + 5193^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32411233 + ... + 32411236.

Almost surely, 2^129644938 is an apocalyptic number.

129644938 is a deficient number, since it is larger than the sum of its proper divisors (64822472).

129644938 is an equidigital number, since it uses as much as digits as its factorization.

129644938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64822471.

The product of its digits is 373248, while the sum is 46.

The square root of 129644938 is about 11386.1731060089. The cubic root of 129644938 is about 506.1180834359.

The spelling of 129644938 in words is "one hundred twenty-nine million, six hundred forty-four thousand, nine hundred thirty-eight".