1981924 has 12 divisors (see below), whose sum is σ = 3963904. Its totient is φ = 849384.

The previous prime is 1981921. The next prime is 1981939. The reversal of 1981924 is 4291891.

1981924 is an admirable number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1981924.

It is not an unprimeable number, because it can be changed into a prime (1981921) 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 3 ways as a sum of consecutive naturals, for example, 35364 + ... + 35419.

2^1981924 is an apocalyptic number.

1981924 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1981924 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1981924 is a wasteful number, since it uses less digits than its factorization.

1981924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70794 (or 70792 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 1981924 is about 1407.8082255762. The cubic root of 1981924 is about 125.6113834734.

The spelling of 1981924 in words is "one million, nine hundred eighty-one thousand, nine hundred twenty-four".