1841997 has 4 divisors (see below), whose sum is σ = 2456000. Its totient is φ = 1227996.

The previous prime is 1841969. The next prime is 1842011. The reversal of 1841997 is 7991481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7991481 = 3 ⋅2663827.

It is not a de Polignac number, because 1841997 - 2⁷ = 1841869 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1841947) 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, 306997 + ... + 307002.

It is an arithmetic number, because the mean of its divisors is an integer number (614000).

2^1841997 is an apocalyptic number.

It is an amenable number.

1841997 is a deficient number, since it is larger than the sum of its proper divisors (614003).

1841997 is an equidigital number, since it uses as much as digits as its factorization.

1841997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614002.

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

The square root of 1841997 is about 1357.2019009713. The cubic root of 1841997 is about 122.5828288913.

The spelling of 1841997 in words is "one million, eight hundred forty-one thousand, nine hundred ninety-seven".