129855723 has 16 divisors (see below), whose sum is σ = 180934656. Its totient is φ = 82684800.

The previous prime is 129855721. The next prime is 129855727. The reversal of 129855723 is 327558921.

It is a happy number.

It is not a de Polignac number, because 129855723 - 2¹ = 129855721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129855721) 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, 82086 + ... + 83652.

It is an arithmetic number, because the mean of its divisors is an integer number (11308416).

Almost surely, 2^129855723 is an apocalyptic number.

129855723 is a deficient number, since it is larger than the sum of its proper divisors (51078933).

129855723 is a wasteful number, since it uses less digits than its factorization.

129855723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794.

The product of its digits is 151200, while the sum is 42.

The square root of 129855723 is about 11395.4255295711. The cubic root of 129855723 is about 506.3922279242.

The spelling of 129855723 in words is "one hundred twenty-nine million, eight hundred fifty-five thousand, seven hundred twenty-three".