129145892 has 12 divisors (see below), whose sum is σ = 228006156. Its totient is φ = 64001280.

The previous prime is 129145879. The next prime is 129145909. The reversal of 129145892 is 298541921.

It can be written as a sum of positive squares in 2 ways, for example, as 28665316 + 100480576 = 5354^2 + 10024^2 .

It is a super-2 number, since 2×129145892² = 33357322840951328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142409 + ... + 143312.

It is an arithmetic number, because the mean of its divisors is an integer number (19000513).

Almost surely, 2^129145892 is an apocalyptic number.

It is an amenable number.

129145892 is a deficient number, since it is larger than the sum of its proper divisors (98860264).

129145892 is a wasteful number, since it uses less digits than its factorization.

129145892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285838 (or 285836 counting only the distinct ones).

The product of its digits is 51840, while the sum is 41.

The square root of 129145892 is about 11364.2374139227. The cubic root of 129145892 is about 505.4678434118.

The spelling of 129145892 in words is "one hundred twenty-nine million, one hundred forty-five thousand, eight hundred ninety-two".