129897 has 16 divisors (see below), whose sum is σ = 204480. Its totient is φ = 81216.

The previous prime is 129893. The next prime is 129901. The reversal of 129897 is 798921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (129893) and next prime (129901).

It is not a de Polignac number, because 129897 - 2² = 129893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318 + ... + 600.

It is an arithmetic number, because the mean of its divisors is an integer number (12780).

2¹²⁹⁸⁹⁷ is an apocalyptic number.

129897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

129897 is a deficient number, since it is larger than the sum of its proper divisors (74583).

129897 is a wasteful number, since it uses less digits than its factorization.

129897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 129897 is about 360.4122639423. The cubic root of 129897 is about 50.6445877562.

It can be divided in two parts, 12989 and 7, that added together give a square (12996 = 114²).

The spelling of 129897 in words is "one hundred twenty-nine thousand, eight hundred ninety-seven".