129429657 has 80 divisors (see below), whose sum is σ = 232087680. Its totient is φ = 70357248.

The previous prime is 129429649. The next prime is 129429659. The reversal of 129429657 is 756924921.

It is not a de Polignac number, because 129429657 - 2³ = 129429649 is a prime.

It is a super-2 number, since 2×129429657² = 33504072222275298, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (129429659) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1772973 + ... + 1773045.

It is an arithmetic number, because the mean of its divisors is an integer number (2901096).

Almost surely, 2^129429657 is an apocalyptic number.

It is an amenable number.

129429657 is a deficient number, since it is larger than the sum of its proper divisors (102658023).

129429657 is an equidigital number, since it uses as much as digits as its factorization.

129429657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 195 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 129429657 is about 11376.7155629382. The cubic root of 129429657 is about 505.8377846082.

The spelling of 129429657 in words is "one hundred twenty-nine million, four hundred twenty-nine thousand, six hundred fifty-seven".