129397 has 4 divisors (see below), whose sum is σ = 131040. Its totient is φ = 127756.

The previous prime is 129379. The next prime is 129401. The reversal of 129397 is 793921.

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: 793921 = 601 ⋅1321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129397 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129347) 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, 697 + ... + 862.

It is an arithmetic number, because the mean of its divisors is an integer number (32760).

2¹²⁹³⁹⁷ is an apocalyptic number.

It is an amenable number.

129397 is a deficient number, since it is larger than the sum of its proper divisors (1643).

129397 is an equidigital number, since it uses as much as digits as its factorization.

129397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

The product of its digits is 3402, while the sum is 31.

The square root of 129397 is about 359.7179450625. The cubic root of 129397 is about 50.5795237600.

It can be divided in two parts, 12 and 9397, that added together give a square (9409 = 97²).

The spelling of 129397 in words is "one hundred twenty-nine thousand, three hundred ninety-seven".