129256442 has 8 divisors (see below), whose sum is σ = 221582496. Its totient is φ = 55395612.

The previous prime is 129256427. The next prime is 129256483. The reversal of 129256442 is 244652921.

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

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, 4616288 + ... + 4616315.

It is an arithmetic number, because the mean of its divisors is an integer number (27697812).

Almost surely, 2^129256442 is an apocalyptic number.

129256442 is a deficient number, since it is larger than the sum of its proper divisors (92326054).

129256442 is an equidigital number, since it uses as much as digits as its factorization.

129256442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9232612.

The product of its digits is 34560, while the sum is 35.

The square root of 129256442 is about 11369.1003162080. The cubic root of 129256442 is about 505.6120305590.

The spelling of 129256442 in words is "one hundred twenty-nine million, two hundred fifty-six thousand, four hundred forty-two".