1780938240 has 80 divisors (see below), whose sum is σ = 5693461488. Its totient is φ = 474914816.

The previous prime is 1780938239. The next prime is 1780938253. The reversal of 1780938240 is 428390871.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 1780938192 and 1780938201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108267 + ... + 123626.

Almost surely, 2^1780938240 is an apocalyptic number.

1780938240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1780938240 is an abundant number, since it is smaller than the sum of its proper divisors (3912523248).

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

1780938240 is an equidigital number, since it uses as much as digits as its factorization.

1780938240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231919 (or 231903 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 1780938240 is about 42201.1639649903. The cubic root of 1780938240 is about 1212.1311711990.

The spelling of 1780938240 in words is "one billion, seven hundred eighty million, nine hundred thirty-eight thousand, two hundred forty".