129896647 has 4 divisors (see below), whose sum is σ = 130289416. Its totient is φ = 129503880.

The previous prime is 129896629. The next prime is 129896659. The reversal of 129896647 is 746698921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746698921 = 12451 ⋅59971.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129896647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129896594 and 129896603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129896147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195888 + ... + 196549.

It is an arithmetic number, because the mean of its divisors is an integer number (32572354).

Almost surely, 2^129896647 is an apocalyptic number.

129896647 is a deficient number, since it is larger than the sum of its proper divisors (392769).

129896647 is an equidigital number, since it uses as much as digits as its factorization.

129896647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392768.

The product of its digits is 1306368, while the sum is 52.

The square root of 129896647 is about 11397.2210209331. The cubic root of 129896647 is about 506.4454188000.

The spelling of 129896647 in words is "one hundred twenty-nine million, eight hundred ninety-six thousand, six hundred forty-seven".