129159640 has 32 divisors (see below), whose sum is σ = 299986560. Its totient is φ = 49996800.

The previous prime is 129159623. The next prime is 129159677. The reversal of 129159640 is 46951921.

It is a self number, because there is not a number n which added to its sum of digits gives 129159640.

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, 50841 + ... + 53320.

It is an arithmetic number, because the mean of its divisors is an integer number (9374580).

Almost surely, 2^129159640 is an apocalyptic number.

129159640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129159640 is an abundant number, since it is smaller than the sum of its proper divisors (170826920).

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

129159640 is a wasteful number, since it uses less digits than its factorization.

129159640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104203 (or 104199 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 129159640 is about 11364.8422778321. The cubic root of 129159640 is about 505.4857790070.

The spelling of 129159640 in words is "one hundred twenty-nine million, one hundred fifty-nine thousand, six hundred forty".