129742 has 4 divisors (see below), whose sum is σ = 194616. Its totient is φ = 64870.

The previous prime is 129737. The next prime is 129749. The reversal of 129742 is 247921.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32434 + ... + 32437.

It is an arithmetic number, because the mean of its divisors is an integer number (48654).

2¹²⁹⁷⁴² is an apocalyptic number.

129742 is a deficient number, since it is larger than the sum of its proper divisors (64874).

129742 is an equidigital number, since it uses as much as digits as its factorization.

129742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64873.

The product of its digits is 1008, while the sum is 25.

The square root of 129742 is about 360.1971682287. The cubic root of 129742 is about 50.6244358013.

The spelling of 129742 in words is "one hundred twenty-nine thousand, seven hundred forty-two".