129783240 has 48 divisors (see below), whose sum is σ = 421796700. Its totient is φ = 34608768.

The previous prime is 129783239. The next prime is 129783257. The reversal of 129783240 is 42387921.

It can be written as a sum of positive squares in 2 ways, for example, as 118853604 + 10929636 = 10902^2 + 3306^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129783195 and 129783204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179895 + ... + 180614.

Almost surely, 2^129783240 is an apocalyptic number.

129783240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129783240 is an abundant number, since it is smaller than the sum of its proper divisors (292013460).

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

129783240 is a wasteful number, since it uses less digits than its factorization.

129783240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360526 (or 360519 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 129783240 is about 11392.2447305173. The cubic root of 129783240 is about 506.2979908780.

The spelling of 129783240 in words is "one hundred twenty-nine million, seven hundred eighty-three thousand, two hundred forty".