1981948 has 12 divisors (see below), whose sum is σ = 3479112. Its totient is φ = 987920.

The previous prime is 1981939. The next prime is 1981949. The reversal of 1981948 is 8491891.

It is a self number, because there is not a number n which added to its sum of digits gives 1981948.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1338 + ... + 2398.

It is an arithmetic number, because the mean of its divisors is an integer number (289926).

2^1981948 is an apocalyptic number.

It is an amenable number.

1981948 is a deficient number, since it is larger than the sum of its proper divisors (1497164).

1981948 is a wasteful number, since it uses less digits than its factorization.

1981948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532 (or 1530 counting only the distinct ones).

The product of its digits is 20736, while the sum is 40.

The square root of 1981948 is about 1407.8167494386. The cubic root of 1981948 is about 125.6118904994.

The spelling of 1981948 in words is "one million, nine hundred eighty-one thousand, nine hundred forty-eight".