129423381 has 8 divisors (see below), whose sum is σ = 173253024. Its totient is φ = 85938000.

The previous prime is 129423361. The next prime is 129423407. The reversal of 129423381 is 183324921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129423381 - 2⁷ = 129423253 is a prime.

It is a super-2 number, since 2×129423381² = 33500823098942322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129423331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85186 + ... + 86691.

It is an arithmetic number, because the mean of its divisors is an integer number (21656628).

Almost surely, 2^129423381 is an apocalyptic number.

It is an amenable number.

129423381 is a deficient number, since it is larger than the sum of its proper divisors (43829643).

129423381 is a wasteful number, since it uses less digits than its factorization.

129423381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172131.

The product of its digits is 10368, while the sum is 33.

The square root of 129423381 is about 11376.4397330624. The cubic root of 129423381 is about 505.8296085088.

The spelling of 129423381 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, three hundred eighty-one".