129423345 has 32 divisors (see below), whose sum is σ = 219024000. Its totient is φ = 65078784.

The previous prime is 129423331. The next prime is 129423353. The reversal of 129423345 is 543324921.

It is not a de Polignac number, because 129423345 - 2⁵ = 129423313 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 65431 + ... + 67379.

It is an arithmetic number, because the mean of its divisors is an integer number (6844500).

Almost surely, 2^129423345 is an apocalyptic number.

129423345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129423345 is a deficient number, since it is larger than the sum of its proper divisors (89600655).

129423345 is a wasteful number, since it uses less digits than its factorization.

129423345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209.

The product of its digits is 25920, while the sum is 33.

The square root of 129423345 is about 11376.4381508449. The cubic root of 129423345 is about 505.8295616088.

The spelling of 129423345 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, three hundred forty-five".