1981148 has 24 divisors (see below), whose sum is σ = 3857280. Its totient is φ = 884160.

The previous prime is 1981141. The next prime is 1981153. The reversal of 1981148 is 8411891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981141) 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, 998 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (160720).

2^1981148 is an apocalyptic number.

It is an amenable number.

1981148 is a deficient number, since it is larger than the sum of its proper divisors (1876132).

1981148 is a wasteful number, since it uses less digits than its factorization.

1981148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277 (or 1275 counting only the distinct ones).

The product of its digits is 2304, while the sum is 32.

The square root of 1981148 is about 1407.5325928731. The cubic root of 1981148 is about 125.5949874262.

The spelling of 1981148 in words is "one million, nine hundred eighty-one thousand, one hundred forty-eight".