129439642 has 8 divisors (see below), whose sum is σ = 196341300. Its totient is φ = 63992544.

The previous prime is 129439637. The next prime is 129439657. The reversal of 129439642 is 246934921.

It can be written as a sum of positive squares in 2 ways, for example, as 128845201 + 594441 = 11351^2 + 771^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 129439595 and 129439604.

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, 363417 + ... + 363772.

Almost surely, 2^129439642 is an apocalyptic number.

129439642 is a deficient number, since it is larger than the sum of its proper divisors (66901658).

129439642 is an equidigital number, since it uses as much as digits as its factorization.

129439642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727280.

The product of its digits is 93312, while the sum is 40.

The square root of 129439642 is about 11377.1543893893. The cubic root of 129439642 is about 505.8507920866.

The spelling of 129439642 in words is "one hundred twenty-nine million, four hundred thirty-nine thousand, six hundred forty-two".