129669712 has 20 divisors (see below), whose sum is σ = 251548756. Its totient is φ = 64753920.

The previous prime is 129669703. The next prime is 129669721. The reversal of 129669712 is 217966921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129669703) and next prime (129669721).

It can be written as a sum of positive squares in 2 ways, for example, as 121352256 + 8317456 = 11016^2 + 2884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9412 + ... + 18652.

Almost surely, 2^129669712 is an apocalyptic number.

It is an amenable number.

129669712 is a deficient number, since it is larger than the sum of its proper divisors (121879044).

129669712 is an equidigital number, since it uses as much as digits as its factorization.

129669712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10126 (or 10120 counting only the distinct ones).

The product of its digits is 81648, while the sum is 43.

The square root of 129669712 is about 11387.2609524855. The cubic root of 129669712 is about 506.1503196112.

The spelling of 129669712 in words is "one hundred twenty-nine million, six hundred sixty-nine thousand, seven hundred twelve".