129489023 has 4 divisors (see below), whose sum is σ = 130167168. Its totient is φ = 128810880.

The previous prime is 129489013. The next prime is 129489043. The reversal of 129489023 is 320984921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129489023 - 2⁴ = 129489007 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 (129489013) 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, 338786 + ... + 339167.

It is an arithmetic number, because the mean of its divisors is an integer number (32541792).

Almost surely, 2^129489023 is an apocalyptic number.

129489023 is a deficient number, since it is larger than the sum of its proper divisors (678145).

129489023 is an equidigital number, since it uses as much as digits as its factorization.

129489023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678144.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 129489023 is about 11379.3243648294. The cubic root of 129489023 is about 505.9151109762.

The spelling of 129489023 in words is "one hundred twenty-nine million, four hundred eighty-nine thousand, twenty-three".