129659042 has 4 divisors (see below), whose sum is σ = 194488566. Its totient is φ = 64829520.

The previous prime is 129659039. The next prime is 129659083. The reversal of 129659042 is 240956921.

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., 83704201 + 45954841 = 9149^2 + 6779^2 .

It is a super-2 number, since 2×129659042² = 33622934344715528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129658987 and 129659005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32414759 + ... + 32414762.

Almost surely, 2^129659042 is an apocalyptic number.

129659042 is a deficient number, since it is larger than the sum of its proper divisors (64829524).

129659042 is an equidigital number, since it uses as much as digits as its factorization.

129659042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64829523.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 129659042 is about 11386.7924368542. The cubic root of 129659042 is about 506.1364362045.

The spelling of 129659042 in words is "one hundred twenty-nine million, six hundred fifty-nine thousand, forty-two".