129782740 has 24 divisors (see below), whose sum is σ = 281336832. Its totient is φ = 50238240.

The previous prime is 129782693. The next prime is 129782789. The reversal of 129782740 is 47287921.

It is a junction number, because it is equal to n+sod(n) for n = 129782693 and 129782702.

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, 104044 + ... + 105283.

It is an arithmetic number, because the mean of its divisors is an integer number (11722368).

Almost surely, 2^129782740 is an apocalyptic number.

129782740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129782740 is an abundant number, since it is smaller than the sum of its proper divisors (151554092).

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

129782740 is a wasteful number, since it uses less digits than its factorization.

129782740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209367 (or 209365 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 129782740 is about 11392.2227857429. Note that the first 3 decimals coincide. The cubic root of 129782740 is about 506.2973406931.

The spelling of 129782740 in words is "one hundred twenty-nine million, seven hundred eighty-two thousand, seven hundred forty".