1981792 has 24 divisors (see below), whose sum is σ = 4132296. Its totient is φ = 932352.

The previous prime is 1981787. The next prime is 1981813. The reversal of 1981792 is 2971891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1278 + ... + 2365.

It is an arithmetic number, because the mean of its divisors is an integer number (172179).

2^1981792 is an apocalyptic number.

It is an amenable number.

1981792 is an abundant number, since it is smaller than the sum of its proper divisors (2150504).

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

1981792 is a wasteful number, since it uses less digits than its factorization.

1981792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3670 (or 3662 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 1981792 is about 1407.7613434102. The cubic root of 1981792 is about 125.6085947572.

Subtracting 1981792 from its reverse (2971891), we obtain a palindrome (990099).

The spelling of 1981792 in words is "one million, nine hundred eighty-one thousand, seven hundred ninety-two".