129383879 has 2 divisors, whose sum is σ = 129383880. Its totient is φ = 129383878.

The previous prime is 129383869. The next prime is 129383899. The reversal of 129383879 is 978383921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129383879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129383869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64691939 + 64691940.

It is an arithmetic number, because the mean of its divisors is an integer number (64691940).

Almost surely, 2^129383879 is an apocalyptic number.

129383879 is a deficient number, since it is larger than the sum of its proper divisors (1).

129383879 is an equidigital number, since it uses as much as digits as its factorization.

129383879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 50.

The square root of 129383879 is about 11374.7034686624. The cubic root of 129383879 is about 505.7781409552.

The spelling of 129383879 in words is "one hundred twenty-nine million, three hundred eighty-three thousand, eight hundred seventy-nine".