129450 has 24 divisors (see below), whose sum is σ = 321408. Its totient is φ = 34480.

The previous prime is 129449. The next prime is 129457. The reversal of 129450 is 54921.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (129457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 282 + ... + 581.

It is an arithmetic number, because the mean of its divisors is an integer number (13392).

2¹²⁹⁴⁵⁰ is an apocalyptic number.

129450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129450 is an abundant number, since it is smaller than the sum of its proper divisors (191958).

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

129450 is a wasteful number, since it uses less digits than its factorization.

129450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878 (or 873 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 129450 is about 359.7916063501. The cubic root of 129450 is about 50.5864284766.

Subtracting from 129450 its reverse (54921), we obtain a square (74529 = 273²).

The spelling of 129450 in words is "one hundred twenty-nine thousand, four hundred fifty".