129727238 has 16 divisors (see below), whose sum is σ = 210423744. Its totient is φ = 59748480.

The previous prime is 129727223. The next prime is 129727267. The reversal of 129727238 is 832727921.

It is a junction number, because it is equal to n+sod(n) for n = 129727195 and 129727204.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 38993 + ... + 42188.

It is an arithmetic number, because the mean of its divisors is an integer number (13151484).

Almost surely, 2^129727238 is an apocalyptic number.

129727238 is a deficient number, since it is larger than the sum of its proper divisors (80696506).

129727238 is a wasteful number, since it uses less digits than its factorization.

129727238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81247.

The product of its digits is 84672, while the sum is 41.

The square root of 129727238 is about 11389.7865651644. The cubic root of 129727238 is about 506.2251571816.

The spelling of 129727238 in words is "one hundred twenty-nine million, seven hundred twenty-seven thousand, two hundred thirty-eight".