1981055448 has 64 divisors (see below), whose sum is σ = 5531560800. Its totient is φ = 656916480.

The previous prime is 1981055437. The next prime is 1981055467. The reversal of 1981055448 is 8445501891.

It is a happy number.

1981055448 is a `hidden beast` number, since 1 + 98 + 1 + 0 + 554 + 4 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17928 + ... + 65448.

Almost surely, 2^1981055448 is an apocalyptic number.

1981055448 is a gapful number since it is divisible by the number (18) 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 1981055448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2765780400).

1981055448 is an abundant number, since it is smaller than the sum of its proper divisors (3550505352).

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

1981055448 is a wasteful number, since it uses less digits than its factorization.

1981055448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47729 (or 47719 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The square root of 1981055448 is about 44509.0490574670. The cubic root of 1981055448 is about 1255.9303161605.

The spelling of 1981055448 in words is "one billion, nine hundred eighty-one million, fifty-five thousand, four hundred forty-eight".