129820707 has 12 divisors (see below), whose sum is σ = 187947864. Its totient is φ = 86349120.

The previous prime is 129820703. The next prime is 129820729. The reversal of 129820707 is 707028921.

It is not a de Polignac number, because 129820707 - 2² = 129820703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129820703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12294 + ... + 20267.

It is an arithmetic number, because the mean of its divisors is an integer number (15662322).

Almost surely, 2^129820707 is an apocalyptic number.

129820707 is a deficient number, since it is larger than the sum of its proper divisors (58127157).

129820707 is a wasteful number, since it uses less digits than its factorization.

129820707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33010 (or 33007 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 129820707 is about 11393.8890199966. The cubic root of 129820707 is about 506.3467070854.

It can be divided in two parts, 129 and 820707, that added together give a square (820836 = 906²).

The spelling of 129820707 in words is "one hundred twenty-nine million, eight hundred twenty thousand, seven hundred seven".