1997841 has 4 divisors (see below), whose sum is σ = 2663792. Its totient is φ = 1331892.

The previous prime is 1997833. The next prime is 1997843. The reversal of 1997841 is 1487991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1997841 - 2³ = 1997833 is a prime.

It is a super-2 number, since 2×1997841² = 7982737322562, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1997841.

It is not an unprimeable number, because it can be changed into a prime (1997843) by changing a digit.

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, 332971 + ... + 332976.

It is an arithmetic number, because the mean of its divisors is an integer number (665948).

2^1997841 is an apocalyptic number.

It is an amenable number.

1997841 is a deficient number, since it is larger than the sum of its proper divisors (665951).

1997841 is an equidigital number, since it uses as much as digits as its factorization.

1997841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665950.

The product of its digits is 18144, while the sum is 39.

The square root of 1997841 is about 1413.4500344901. The cubic root of 1997841 is about 125.9467525071.

The spelling of 1997841 in words is "one million, nine hundred ninety-seven thousand, eight hundred forty-one".