129653946 has 20 divisors (see below), whose sum is σ = 290521242. Its totient is φ = 43217928.

The previous prime is 129653941. The next prime is 129653947. The reversal of 129653946 is 649356921.

It can be written as a sum of positive squares in only one way, i.e., 129618225 + 35721 = 11385^2 + 189^2 .

It is not an unprimeable number, because it can be changed into a prime (129653941) 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 9 ways as a sum of consecutive naturals, for example, 400005 + ... + 400328.

Almost surely, 2^129653946 is an apocalyptic number.

129653946 is an abundant number, since it is smaller than the sum of its proper divisors (160867296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129653946 is an equidigital number, since it uses as much as digits as its factorization.

129653946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800347 (or 800338 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 129653946 is about 11386.5686666353. The cubic root of 129653946 is about 506.1298052103.

The spelling of 129653946 in words is "one hundred twenty-nine million, six hundred fifty-three thousand, nine hundred forty-six".