129423653 has 4 divisors (see below), whose sum is σ = 129732960. Its totient is φ = 129114348.

The previous prime is 129423631. The next prime is 129423661. The reversal of 129423653 is 356324921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 129423653 - 2⁶ = 129423589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129423673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154025 + ... + 154862.

It is an arithmetic number, because the mean of its divisors is an integer number (32433240).

Almost surely, 2^129423653 is an apocalyptic number.

It is an amenable number.

129423653 is a deficient number, since it is larger than the sum of its proper divisors (309307).

129423653 is an equidigital number, since it uses as much as digits as its factorization.

129423653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309306.

The product of its digits is 38880, while the sum is 35.

The square root of 129423653 is about 11376.4516875870. The cubic root of 129423653 is about 505.8299628640.

The spelling of 129423653 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, six hundred fifty-three".