129722765 has 8 divisors (see below), whose sum is σ = 156169728. Its totient is φ = 103443280.

The previous prime is 129722759. The next prime is 129722779. The reversal of 129722765 is 567227921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129722765 - 2¹² = 129718669 is a prime.

It is a Duffinian number.

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, 40157 + ... + 43266.

It is an arithmetic number, because the mean of its divisors is an integer number (19521216).

Almost surely, 2^129722765 is an apocalyptic number.

It is an amenable number.

129722765 is a deficient number, since it is larger than the sum of its proper divisors (26446963).

129722765 is an equidigital number, since it uses as much as digits as its factorization.

129722765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83739.

The product of its digits is 105840, while the sum is 41.

The square root of 129722765 is about 11389.5902033392. The cubic root of 129722765 is about 506.2193388939.

The spelling of 129722765 in words is "one hundred twenty-nine million, seven hundred twenty-two thousand, seven hundred sixty-five".