129748265 has 8 divisors (see below), whose sum is σ = 155805000. Its totient is φ = 103727232.

The previous prime is 129748261. The next prime is 129748271. The reversal of 129748265 is 562847921.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 5626384 + 124121881 = 2372^2 + 11141^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 129748265 - 2² = 129748261 is a prime.

It is a super-2 number, since 2×129748265² = 33669224541020450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129748261) by changing a digit.

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, 140 + ... + 16109.

It is an arithmetic number, because the mean of its divisors is an integer number (19475625).

Almost surely, 2^129748265 is an apocalyptic number.

It is an amenable number.

129748265 is a deficient number, since it is larger than the sum of its proper divisors (26056735).

129748265 is a wasteful number, since it uses less digits than its factorization.

129748265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17851.

The product of its digits is 241920, while the sum is 44.

The square root of 129748265 is about 11390.7095915926. The cubic root of 129748265 is about 506.2525064145.

The spelling of 129748265 in words is "one hundred twenty-nine million, seven hundred forty-eight thousand, two hundred sixty-five".