129723099 has 16 divisors (see below), whose sum is σ = 189177984. Its totient is φ = 78416000.

The previous prime is 129723091. The next prime is 129723109. The reversal of 129723099 is 990327921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129723099 - 2³ = 129723091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129723099.

It is not an unprimeable number, because it can be changed into a prime (129723091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8332 + ... + 18134.

It is an arithmetic number, because the mean of its divisors is an integer number (11823624).

Almost surely, 2^129723099 is an apocalyptic number.

129723099 is a deficient number, since it is larger than the sum of its proper divisors (59454885).

129723099 is a wasteful number, since it uses less digits than its factorization.

129723099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10218.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 129723099 is about 11389.6048658415. The cubic root of 129723099 is about 506.2197733515.

The spelling of 129723099 in words is "one hundred twenty-nine million, seven hundred twenty-three thousand, ninety-nine".