129845438 has 4 divisors (see below), whose sum is σ = 194768160. Its totient is φ = 64922718.

The previous prime is 129845413. The next prime is 129845459. The reversal of 129845438 is 834548921.

It is a happy number.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32461358 + ... + 32461361.

It is an arithmetic number, because the mean of its divisors is an integer number (48692040).

Almost surely, 2^129845438 is an apocalyptic number.

129845438 is a deficient number, since it is larger than the sum of its proper divisors (64922722).

129845438 is an equidigital number, since it uses as much as digits as its factorization.

129845438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64922721.

The product of its digits is 276480, while the sum is 44.

The square root of 129845438 is about 11394.9742430600. The cubic root of 129845438 is about 506.3788582617.

The spelling of 129845438 in words is "one hundred twenty-nine million, eight hundred forty-five thousand, four hundred thirty-eight".