129977 has 4 divisors (see below), whose sum is σ = 132240. Its totient is φ = 127716.

The previous prime is 129971. The next prime is 130003. The reversal of 129977 is 779921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 779921 = 59 ⋅13219.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1043 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (33060).

2¹²⁹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

129977 is a deficient number, since it is larger than the sum of its proper divisors (2263).

129977 is an equidigital number, since it uses as much as digits as its factorization.

129977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262.

The product of its digits is 7938, while the sum is 35.

The square root of 129977 is about 360.5232308742. The cubic root of 129977 is about 50.6549824935.

The spelling of 129977 in words is "one hundred twenty-nine thousand, nine hundred seventy-seven".