1981860244 has 24 divisors (see below), whose sum is σ = 4268622848. Its totient is φ = 784032480.

The previous prime is 1981860241. The next prime is 1981860259. The reversal of 1981860244 is 4420681891.

It is a self number, because there is not a number n which added to its sum of digits gives 1981860244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981860241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2721972 + ... + 2722699.

Almost surely, 2^1981860244 is an apocalyptic number.

1981860244 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1981860244 is an abundant number, since it is smaller than the sum of its proper divisors (2286762604).

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

1981860244 is a wasteful number, since it uses less digits than its factorization.

1981860244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5444695 (or 5444693 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 1981860244 is about 44518.0889526943. The cubic root of 1981860244 is about 1256.1003653890.

The spelling of 1981860244 in words is "one billion, nine hundred eighty-one million, eight hundred sixty thousand, two hundred forty-four".