129942955 has 4 divisors (see below), whose sum is σ = 155931552. Its totient is φ = 103954360.

The previous prime is 129942931. The next prime is 129942959. The reversal of 129942955 is 559249921.

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

It is not a de Polignac number, because 129942955 - 2⁹ = 129942443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129942959) 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, 12994291 + ... + 12994300.

It is an arithmetic number, because the mean of its divisors is an integer number (38982888).

Almost surely, 2^129942955 is an apocalyptic number.

129942955 is a deficient number, since it is larger than the sum of its proper divisors (25988597).

129942955 is an equidigital number, since it uses as much as digits as its factorization.

129942955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25988596.

The product of its digits is 291600, while the sum is 46.

The square root of 129942955 is about 11399.2523877665. The cubic root of 129942955 is about 506.5055940460.

The spelling of 129942955 in words is "one hundred twenty-nine million, nine hundred forty-two thousand, nine hundred fifty-five".