129279423 has 48 divisors (see below), whose sum is σ = 216672000. Its totient is φ = 67122432.

The previous prime is 129279379. The next prime is 129279487. The reversal of 129279423 is 324972921.

It is not a de Polignac number, because 129279423 - 2¹⁷ = 129148351 is a prime.

It is a super-2 number, since 2×129279423² = 33426338422425858, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129279823) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 258828 + ... + 259326.

It is an arithmetic number, because the mean of its divisors is an integer number (4514000).

Almost surely, 2^129279423 is an apocalyptic number.

129279423 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129279423 is a deficient number, since it is larger than the sum of its proper divisors (87392577).

129279423 is a wasteful number, since it uses less digits than its factorization.

129279423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608 (or 595 counting only the distinct ones).

The product of its digits is 54432, while the sum is 39.

The square root of 129279423 is about 11370.1109493267. The cubic root of 129279423 is about 505.6419936859.

The spelling of 129279423 in words is "one hundred twenty-nine million, two hundred seventy-nine thousand, four hundred twenty-three".