129423449 has 4 divisors (see below), whose sum is σ = 129784320. Its totient is φ = 129062580.

The previous prime is 129423443. The next prime is 129423451. The reversal of 129423449 is 944324921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 944324921 = 71 ⋅13300351.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129423449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129423443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179897 + ... + 180614.

It is an arithmetic number, because the mean of its divisors is an integer number (32446080).

Almost surely, 2^129423449 is an apocalyptic number.

It is an amenable number.

129423449 is a deficient number, since it is larger than the sum of its proper divisors (360871).

129423449 is an equidigital number, since it uses as much as digits as its factorization.

129423449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360870.

The product of its digits is 62208, while the sum is 38.

The square root of 129423449 is about 11376.4427216947. The cubic root of 129423449 is about 505.8296970976.

The spelling of 129423449 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, four hundred forty-nine".