129426 has 32 divisors (see below), whose sum is σ = 295488. Its totient is φ = 37440.

The previous prime is 129419. The next prime is 129439. The reversal of 129426 is 624921.

It is a junction number, because it is equal to n+sod(n) for n = 129396 and 129405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2416 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (9234).

2¹²⁹⁴²⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (147744).

129426 is an abundant number, since it is smaller than the sum of its proper divisors (166062).

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

129426 is a wasteful number, since it uses less digits than its factorization.

129426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106.

The product of its digits is 864, while the sum is 24.

The square root of 129426 is about 359.7582521639. The cubic root of 129426 is about 50.5833020460.

It can be divided in two parts, 129 and 426, that added together give a palindrome (555).

The spelling of 129426 in words is "one hundred twenty-nine thousand, four hundred twenty-six".