129903640 has 32 divisors (see below), whose sum is σ = 301714560. Its totient is φ = 50284800.

The previous prime is 129903623. The next prime is 129903667. The reversal of 129903640 is 46309921.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 129903596 and 129903605.

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, 51141 + ... + 53620.

It is an arithmetic number, because the mean of its divisors is an integer number (9428580).

Almost surely, 2^129903640 is an apocalyptic number.

129903640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129903640 is an abundant number, since it is smaller than the sum of its proper divisors (171810920).

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

129903640 is a wasteful number, since it uses less digits than its factorization.

129903640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104803 (or 104799 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 129903640 is about 11397.5278021157. The cubic root of 129903640 is about 506.4545068181.

The spelling of 129903640 in words is "one hundred twenty-nine million, nine hundred three thousand, six hundred forty".