129918 has 16 divisors (see below), whose sum is σ = 264960. Its totient is φ = 42456.

The previous prime is 129917. The next prime is 129919. The reversal of 129918 is 819921.

It is an interprime number because it is at equal distance from previous prime (129917) and next prime (129919).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171 + ... + 537.

It is an arithmetic number, because the mean of its divisors is an integer number (16560).

2¹²⁹⁹¹⁸ is an apocalyptic number.

129918 is an abundant number, since it is smaller than the sum of its proper divisors (135042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129918 is a wasteful number, since it uses less digits than its factorization.

129918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431.

The product of its digits is 1296, while the sum is 30.

The square root of 129918 is about 360.4413960688. The cubic root of 129918 is about 50.6473167878.

The spelling of 129918 in words is "one hundred twenty-nine thousand, nine hundred eighteen".