129923379 has 16 divisors (see below), whose sum is σ = 193328800. Its totient is φ = 86233248.

The previous prime is 129923377. The next prime is 129923407. The reversal of 129923379 is 973329921.

It is a happy number.

It is not a de Polignac number, because 129923379 - 2¹ = 129923377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129923371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4324 + ... + 16689.

It is an arithmetic number, because the mean of its divisors is an integer number (12083050).

Almost surely, 2^129923379 is an apocalyptic number.

129923379 is a deficient number, since it is larger than the sum of its proper divisors (63405421).

129923379 is a wasteful number, since it uses less digits than its factorization.

129923379 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21251 (or 21245 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 129923379 is about 11398.3937026232. The cubic root of 129923379 is about 506.4801576241.

It can be divided in two parts, 1299 and 23379, that multiplied together give a triangular number (30369321 = T₇₇₉₃).

The spelling of 129923379 in words is "one hundred twenty-nine million, nine hundred twenty-three thousand, three hundred seventy-nine".