129198774 has 16 divisors (see below), whose sum is σ = 269632512. Its totient is φ = 41193768.

The previous prime is 129198757. The next prime is 129198779. The reversal of 129198774 is 477891921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129198779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 467974 + ... + 468249.

It is an arithmetic number, because the mean of its divisors is an integer number (16852032).

Almost surely, 2^129198774 is an apocalyptic number.

129198774 is an abundant number, since it is smaller than the sum of its proper divisors (140433738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129198774 is a wasteful number, since it uses less digits than its factorization.

129198774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 936251.

The product of its digits is 254016, while the sum is 48.

The square root of 129198774 is about 11366.5638607277. The cubic root of 129198774 is about 505.5368261270.

The spelling of 129198774 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, seven hundred seventy-four".