129704755 has 4 divisors (see below), whose sum is σ = 155645712. Its totient is φ = 103763800.

The previous prime is 129704749. The next prime is 129704759. The reversal of 129704755 is 557407921.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 129704755 - 2⁵ = 129704723 is a prime.

It is a super-2 number, since 2×129704755² = 33646646939220050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129704759) 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, 12970471 + ... + 12970480.

It is an arithmetic number, because the mean of its divisors is an integer number (38911428).

Almost surely, 2^129704755 is an apocalyptic number.

129704755 is a deficient number, since it is larger than the sum of its proper divisors (25940957).

129704755 is an equidigital number, since it uses as much as digits as its factorization.

129704755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25940956.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 129704755 is about 11388.7995416550. The cubic root of 129704755 is about 506.1959109006.

The spelling of 129704755 in words is "one hundred twenty-nine million, seven hundred four thousand, seven hundred fifty-five".