129408494 has 4 divisors (see below), whose sum is σ = 194112744. Its totient is φ = 64704246.

The previous prime is 129408493. The next prime is 129408509. The reversal of 129408494 is 494804921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 494804921 = 13 ⋅38061917.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129408491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32352122 + ... + 32352125.

It is an arithmetic number, because the mean of its divisors is an integer number (48528186).

Almost surely, 2^129408494 is an apocalyptic number.

129408494 is a deficient number, since it is larger than the sum of its proper divisors (64704250).

129408494 is an equidigital number, since it uses as much as digits as its factorization.

129408494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64704249.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 129408494 is about 11375.7854234334. The cubic root of 129408494 is about 505.8102133164.

The spelling of 129408494 in words is "one hundred twenty-nine million, four hundred eight thousand, four hundred ninety-four".