129777389 has 16 divisors (see below), whose sum is σ = 154186368. Its totient is φ = 106909632.

The previous prime is 129777379. The next prime is 129777409. The reversal of 129777389 is 983777921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129777389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129777389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129777379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18479 + ... + 24515.

It is an arithmetic number, because the mean of its divisors is an integer number (9636648).

Almost surely, 2^129777389 is an apocalyptic number.

It is an amenable number.

129777389 is a deficient number, since it is larger than the sum of its proper divisors (24408979).

129777389 is an equidigital number, since it uses as much as digits as its factorization.

129777389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164.

The product of its digits is 1333584, while the sum is 53.

The square root of 129777389 is about 11391.9879301200. The cubic root of 129777389 is about 506.2903823094.

The spelling of 129777389 in words is "one hundred twenty-nine million, seven hundred seventy-seven thousand, three hundred eighty-nine".