129723368 has 8 divisors (see below), whose sum is σ = 243231330. Its totient is φ = 64861680.

The previous prime is 129723353. The next prime is 129723397. The reversal of 129723368 is 863327921.

It can be written as a sum of positive squares in only one way, i.e., 127283524 + 2439844 = 11282^2 + 1562^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8107703 + ... + 8107718.

Almost surely, 2^129723368 is an apocalyptic number.

It is an amenable number.

129723368 is a deficient number, since it is larger than the sum of its proper divisors (113507962).

129723368 is a wasteful number, since it uses less digits than its factorization.

129723368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16215427 (or 16215423 counting only the distinct ones).

The product of its digits is 108864, while the sum is 41.

The square root of 129723368 is about 11389.6166748491. The cubic root of 129723368 is about 506.2201232584.

The spelling of 129723368 in words is "one hundred twenty-nine million, seven hundred twenty-three thousand, three hundred sixty-eight".