1819381944 has 64 divisors (see below), whose sum is σ = 4664880000. Its totient is φ = 591002496.

The previous prime is 1819381919. The next prime is 1819381957. The reversal of 1819381944 is 4491839181.

It is a hoax number, since the sum of its digits (48) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1819381893 and 1819381902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 513202 + ... + 516734.

It is an arithmetic number, because the mean of its divisors is an integer number (72888750).

Almost surely, 2^1819381944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1819381944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2332440000).

1819381944 is an abundant number, since it is smaller than the sum of its proper divisors (2845498056).

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

1819381944 is a wasteful number, since it uses less digits than its factorization.

1819381944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4084 (or 4080 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 1819381944 is about 42654.2136722739. The cubic root of 1819381944 is about 1220.7909284974.

The spelling of 1819381944 in words is "one billion, eight hundred nineteen million, three hundred eighty-one thousand, nine hundred forty-four".