129806042 has 4 divisors (see below), whose sum is σ = 194709066. Its totient is φ = 64903020.

The previous prime is 129806011. The next prime is 129806051. The reversal of 129806042 is 240608921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 240608921 = 7 ⋅34372703.

It can be written as a sum of positive squares in only one way, i.e., 129709321 + 96721 = 11389^2 + 311^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32451509 + ... + 32451512.

Almost surely, 2^129806042 is an apocalyptic number.

129806042 is a deficient number, since it is larger than the sum of its proper divisors (64903024).

129806042 is an equidigital number, since it uses as much as digits as its factorization.

129806042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64903023.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 129806042 is about 11393.2454550931. The cubic root of 129806042 is about 506.3276401372.

The spelling of 129806042 in words is "one hundred twenty-nine million, eight hundred six thousand, forty-two".