1863981812 has 48 divisors (see below), whose sum is σ = 4070183040. Its totient is φ = 725635200.

The previous prime is 1863981809. The next prime is 1863981817. The reversal of 1863981812 is 2181893681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1863981817) 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, 709862 + ... + 712482.

It is an arithmetic number, because the mean of its divisors is an integer number (84795480).

Almost surely, 2^1863981812 is an apocalyptic number.

It is an amenable number.

1863981812 is an abundant number, since it is smaller than the sum of its proper divisors (2206201228).

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

1863981812 is a wasteful number, since it uses less digits than its factorization.

1863981812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4952 (or 4950 counting only the distinct ones).

The product of its digits is 165888, while the sum is 47.

The square root of 1863981812 is about 43173.8556536245. The cubic root of 1863981812 is about 1230.6858958964.

The spelling of 1863981812 in words is "one billion, eight hundred sixty-three million, nine hundred eighty-one thousand, eight hundred twelve".