129423459 has 32 divisors (see below), whose sum is σ = 199618560. Its totient is φ = 73764000.

The previous prime is 129423457. The next prime is 129423479. The reversal of 129423459 is 954324921.

It is not a de Polignac number, because 129423459 - 2¹ = 129423457 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (129423451) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 93994 + ... + 95360.

It is an arithmetic number, because the mean of its divisors is an integer number (6238080).

Almost surely, 2^129423459 is an apocalyptic number.

129423459 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

129423459 is a deficient number, since it is larger than the sum of its proper divisors (70195101).

129423459 is a wasteful number, since it uses less digits than its factorization.

129423459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551.

The product of its digits is 77760, while the sum is 39.

The square root of 129423459 is about 11376.4431611994. The cubic root of 129423459 is about 505.8297101254.

It can be divided in two parts, 1294 and 23459, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 129423459 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, four hundred fifty-nine".