129497840 has 40 divisors (see below), whose sum is σ = 318796560. Its totient is φ = 48751616.

The previous prime is 129497807. The next prime is 129497867. The reversal of 129497840 is 48794921.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 129497791 and 129497800.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46250 + ... + 48969.

It is an arithmetic number, because the mean of its divisors is an integer number (7969914).

Almost surely, 2^129497840 is an apocalyptic number.

129497840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129497840 is an abundant number, since it is smaller than the sum of its proper divisors (189298720).

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

129497840 is a wasteful number, since it uses less digits than its factorization.

129497840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95249 (or 95243 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 129497840 is about 11379.7117713939. The cubic root of 129497840 is about 505.9265934226.

The spelling of 129497840 in words is "one hundred twenty-nine million, four hundred ninety-seven thousand, eight hundred forty".