129081892 has 24 divisors (see below), whose sum is σ = 236149760. Its totient is φ = 61663680.

The previous prime is 129081889. The next prime is 129081893. The reversal of 129081892 is 298180921.

It is not an unprimeable number, because it can be changed into a prime (129081893) 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, 3208 + ... + 16384.

Almost surely, 2^129081892 is an apocalyptic number.

It is an amenable number.

129081892 is a deficient number, since it is larger than the sum of its proper divisors (107067868).

129081892 is a wasteful number, since it uses less digits than its factorization.

129081892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13291 (or 13289 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 129081892 is about 11361.4212139151. The cubic root of 129081892 is about 505.3843324647.

The spelling of 129081892 in words is "one hundred twenty-nine million, eighty-one thousand, eight hundred ninety-two".