1865131394412 has 384 divisors, whose sum is σ = 5601661083648. Its totient is φ = 474041548800.

The previous prime is 1865131394387. The next prime is 1865131394419. The reversal of 1865131394412 is 2144931315681.

It is not an unprimeable number, because it can be changed into a prime (1865131394419) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 413277468 + ... + 413281980.

It is an arithmetic number, because the mean of its divisors is an integer number (14587659072).

Almost surely, 2^{1865131394412} is an apocalyptic number.

1865131394412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1865131394412, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2800830541824).

1865131394412 is an abundant number, since it is smaller than the sum of its proper divisors (3736529689236).

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

1865131394412 is a wasteful number, since it uses less digits than its factorization.

1865131394412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5049 (or 5047 counting only the distinct ones).

The product of its digits is 622080, while the sum is 48.

The spelling of 1865131394412 in words is "one trillion, eight hundred sixty-five billion, one hundred thirty-one million, three hundred ninety-four thousand, four hundred twelve".