1856385640004 has 24 divisors (see below), whose sum is σ = 3715278298368. Its totient is φ = 795056627520.

The previous prime is 1856385639877. The next prime is 1856385640007. The reversal of 1856385640004 is 4000465836581.

It is not an unprimeable number, because it can be changed into a prime (1856385640007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22341884 + ... + 22424819.

It is an arithmetic number, because the mean of its divisors is an integer number (154803262432).

Almost surely, 2^{1856385640004} is an apocalyptic number.

1856385640004 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1856385640004 is an abundant number, since it is smaller than the sum of its proper divisors (1858892658364).

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

1856385640004 is a wasteful number, since it uses less digits than its factorization.

1856385640004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44768195 (or 44768193 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 1856385640004 in words is "one trillion, eight hundred fifty-six billion, three hundred eighty-five million, six hundred forty thousand, four".