1840393187840 has 80 divisors (see below), whose sum is σ = 4644874048320. Its totient is φ = 697412136960.

The previous prime is 1840393187839. The next prime is 1840393187849. The reversal of 1840393187840 is 487813930481.

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

It is not an unprimeable number, because it can be changed into a prime (1840393187849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18869876 + ... + 18967155.

It is an arithmetic number, because the mean of its divisors is an integer number (58060925604).

Almost surely, 2^{1840393187840} is an apocalyptic number.

1840393187840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1840393187840 is an abundant number, since it is smaller than the sum of its proper divisors (2804480860480).

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

1840393187840 is an equidigital number, since it uses as much as digits as its factorization.

1840393187840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37837073 (or 37837057 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 56.

The spelling of 1840393187840 in words is "one trillion, eight hundred forty billion, three hundred ninety-three million, one hundred eighty-seven thousand, eight hundred forty".