129726742 has 4 divisors (see below), whose sum is σ = 194590116. Its totient is φ = 64863370.

The previous prime is 129726731. The next prime is 129726761. The reversal of 129726742 is 247627921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 247627921 = 10391 ⋅23831.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 129726695 and 129726704.

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 as a sum of consecutive naturals, namely, 32431684 + ... + 32431687.

It is an arithmetic number, because the mean of its divisors is an integer number (48647529).

Almost surely, 2^129726742 is an apocalyptic number.

129726742 is a deficient number, since it is larger than the sum of its proper divisors (64863374).

129726742 is an equidigital number, since it uses as much as digits as its factorization.

129726742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64863373.

The product of its digits is 84672, while the sum is 40.

The square root of 129726742 is about 11389.7647912501. The cubic root of 129726742 is about 506.2245120125.

The spelling of 129726742 in words is "one hundred twenty-nine million, seven hundred twenty-six thousand, seven hundred forty-two".