1861819488 has 72 divisors (see below), whose sum is σ = 5477144400. Its totient is φ = 599203584.

The previous prime is 1861819441. The next prime is 1861819489. The reversal of 1861819488 is 8849181681.

It is a happy number.

1861819488 is a `hidden beast` number, since 1 + 8 + 618 + 19 + 4 + 8 + 8 = 666.

1861819488 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861819489) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103108 + ... + 119811.

It is an arithmetic number, because the mean of its divisors is an integer number (76071450).

Almost surely, 2^1861819488 is an apocalyptic number.

1861819488 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1861819488 is an abundant number, since it is smaller than the sum of its proper divisors (3615324912).

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

1861819488 is a wasteful number, since it uses less digits than its factorization.

1861819488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222964 (or 222953 counting only the distinct ones).

The product of its digits is 884736, while the sum is 54.

The square root of 1861819488 is about 43148.8063334318. The cubic root of 1861819488 is about 1230.2098234154.

The spelling of 1861819488 in words is "one billion, eight hundred sixty-one million, eight hundred nineteen thousand, four hundred eighty-eight".