129242 has 4 divisors (see below), whose sum is σ = 193866. Its totient is φ = 64620.

The previous prime is 129229. The next prime is 129263. The reversal of 129242 is 242921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 242921 = 7 ⋅34703.

It can be written as a sum of positive squares in only one way, i.e., 128881 + 361 = 359^2 + 19^2 .

It is a super-3 number, since 3×129242³ = 6476379133321464, which contains 333 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 129242.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32309 + ... + 32312.

2¹²⁹²⁴² is an apocalyptic number.

129242 is a deficient number, since it is larger than the sum of its proper divisors (64624).

129242 is an equidigital number, since it uses as much as digits as its factorization.

129242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64623.

The product of its digits is 288, while the sum is 20.

The square root of 129242 is about 359.5024339278. The cubic root of 129242 is about 50.5593198948.

The spelling of 129242 in words is "one hundred twenty-nine thousand, two hundred forty-two".