129955442 has 4 divisors (see below), whose sum is σ = 194933166. Its totient is φ = 64977720.

The previous prime is 129955373. The next prime is 129955447. The reversal of 129955442 is 244559921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244559921 = 109 ⋅2243669.

It can be written as a sum of positive squares in only one way, i.e., 83156161 + 46799281 = 9119^2 + 6841^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129955442.

It is not an unprimeable number, because it can be changed into a prime (129955447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32488859 + ... + 32488862.

Almost surely, 2^129955442 is an apocalyptic number.

129955442 is a deficient number, since it is larger than the sum of its proper divisors (64977724).

129955442 is an equidigital number, since it uses as much as digits as its factorization.

129955442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64977723.

The product of its digits is 129600, while the sum is 41.

The square root of 129955442 is about 11399.8000859664. The cubic root of 129955442 is about 506.5218179159.

The spelling of 129955442 in words is "one hundred twenty-nine million, nine hundred fifty-five thousand, four hundred forty-two".