129640892 has 6 divisors (see below), whose sum is σ = 226871568. Its totient is φ = 64820444.

The previous prime is 129640891. The next prime is 129640897. The reversal of 129640892 is 298046921.

129640892 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129640891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16205108 + ... + 16205115.

It is an arithmetic number, because the mean of its divisors is an integer number (37811928).

Almost surely, 2^129640892 is an apocalyptic number.

It is an amenable number.

129640892 is a deficient number, since it is larger than the sum of its proper divisors (97230676).

129640892 is a wasteful number, since it uses less digits than its factorization.

129640892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32410227 (or 32410225 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 129640892 is about 11385.9954329870. The cubic root of 129640892 is about 506.1128183504.

The spelling of 129640892 in words is "one hundred twenty-nine million, six hundred forty thousand, eight hundred ninety-two".