129688340 has 24 divisors (see below), whose sum is σ = 272711040. Its totient is φ = 51805728.

The previous prime is 129688337. The next prime is 129688373. The reversal of 129688340 is 43886921.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12521 + ... + 20399.

It is an arithmetic number, because the mean of its divisors is an integer number (11362960).

Almost surely, 2^129688340 is an apocalyptic number.

129688340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129688340 is an abundant number, since it is smaller than the sum of its proper divisors (143022700).

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

129688340 is a wasteful number, since it uses less digits than its factorization.

129688340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8711 (or 8709 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 129688340 is about 11388.0788546620. The cubic root of 129688340 is about 506.1745558458.

The spelling of 129688340 in words is "one hundred twenty-nine million, six hundred eighty-eight thousand, three hundred forty".