129420775 has 12 divisors (see below), whose sum is σ = 175071384. Its totient is φ = 94124000.

The previous prime is 129420727. The next prime is 129420803. The reversal of 129420775 is 577024921.

It is not a de Polignac number, because 129420775 - 2¹⁹ = 128896487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235036 + ... + 235585.

It is an arithmetic number, because the mean of its divisors is an integer number (14589282).

Almost surely, 2^129420775 is an apocalyptic number.

129420775 is a deficient number, since it is larger than the sum of its proper divisors (45650609).

129420775 is a wasteful number, since it uses less digits than its factorization.

129420775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470642 (or 470637 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 129420775 is about 11376.3251975319. The cubic root of 129420775 is about 505.8262134478.

The spelling of 129420775 in words is "one hundred twenty-nine million, four hundred twenty thousand, seven hundred seventy-five".