1781783340 has 48 divisors (see below), whose sum is σ = 5059272960. Its totient is φ = 468448960.

The previous prime is 1781783317. The next prime is 1781783347. The reversal of 1781783340 is 433871871.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1781783292 and 1781783301.

It is not an unprimeable number, because it can be changed into a prime (1781783347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204870 + ... + 213389.

It is an arithmetic number, because the mean of its divisors is an integer number (105401520).

Almost surely, 2^1781783340 is an apocalyptic number.

1781783340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1781783340 is an abundant number, since it is smaller than the sum of its proper divisors (3277489620).

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

1781783340 is a wasteful number, since it uses less digits than its factorization.

1781783340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418342 (or 418340 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 1781783340 is about 42211.1755344482. The cubic root of 1781783340 is about 1212.3228697921.

The spelling of 1781783340 in words is "one billion, seven hundred eighty-one million, seven hundred eighty-three thousand, three hundred forty".