129742305 has 32 divisors (see below), whose sum is σ = 258812928. Its totient is φ = 53918400.

The previous prime is 129742297. The next prime is 129742367. The reversal of 129742305 is 503247921.

It is not a de Polignac number, because 129742305 - 2³ = 129742297 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55011 + ... + 57320.

It is an arithmetic number, because the mean of its divisors is an integer number (8087904).

Almost surely, 2^129742305 is an apocalyptic number.

129742305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129742305 is a deficient number, since it is larger than the sum of its proper divisors (129070623).

129742305 is a wasteful number, since it uses less digits than its factorization.

129742305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112357.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 129742305 is about 11390.4479718754. The cubic root of 129742305 is about 506.2447547086.

The spelling of 129742305 in words is "one hundred twenty-nine million, seven hundred forty-two thousand, three hundred five".