129286979 has 4 divisors (see below), whose sum is σ = 134908176. Its totient is φ = 123665784.

The previous prime is 129286967. The next prime is 129286987. The reversal of 129286979 is 979682921.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129286979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129286979.

It is not an unprimeable number, because it can be changed into a prime (129286909) 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, 2810564 + ... + 2810609.

It is an arithmetic number, because the mean of its divisors is an integer number (33727044).

Almost surely, 2^129286979 is an apocalyptic number.

129286979 is a deficient number, since it is larger than the sum of its proper divisors (5621197).

129286979 is an equidigital number, since it uses as much as digits as its factorization.

129286979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5621196.

The product of its digits is 979776, while the sum is 53.

The square root of 129286979 is about 11370.4432191538. The cubic root of 129286979 is about 505.6518445871.

The spelling of 129286979 in words is "one hundred twenty-nine million, two hundred eighty-six thousand, nine hundred seventy-nine".