129235023 has 6 divisors (see below), whose sum is σ = 186672824. Its totient is φ = 86156676.

The previous prime is 129234983. The next prime is 129235033. The reversal of 129235023 is 320532921.

129235023 is a `hidden beast` number, since 1 + 292 + 350 + 23 = 666.

It is not a de Polignac number, because 129235023 - 2¹³ = 129226831 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 (129235033) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7179715 + ... + 7179732.

Almost surely, 2^129235023 is an apocalyptic number.

129235023 is a deficient number, since it is larger than the sum of its proper divisors (57437801).

129235023 is a wasteful number, since it uses less digits than its factorization.

129235023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14359453 (or 14359450 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 129235023 is about 11368.1582941126. The cubic root of 129235023 is about 505.5841008038.

Adding to 129235023 its reverse (320532921), we get a palindrome (449767944).

It can be divided in two parts, 1292 and 35023, that added together give a triangular number (36315 = T₂₆₉).

The spelling of 129235023 in words is "one hundred twenty-nine million, two hundred thirty-five thousand, twenty-three".