129785123 has 8 divisors (see below), whose sum is σ = 147990528. Its totient is φ = 112754304.

The previous prime is 129785099. The next prime is 129785129. The reversal of 129785123 is 321587921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129785123 - 2⁶ = 129785059 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (129785129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293411 + ... + 293852.

It is an arithmetic number, because the mean of its divisors is an integer number (18498816).

Almost surely, 2^129785123 is an apocalyptic number.

129785123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

129785123 is a deficient number, since it is larger than the sum of its proper divisors (18205405).

129785123 is a wasteful number, since it uses less digits than its factorization.

129785123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587293.

The product of its digits is 30240, while the sum is 38.

The square root of 129785123 is about 11392.3273741585. The cubic root of 129785123 is about 506.3004394595.

The spelling of 129785123 in words is "one hundred twenty-nine million, seven hundred eighty-five thousand, one hundred twenty-three".