1997854 has 4 divisors (see below), whose sum is σ = 2996784. Its totient is φ = 998926.

The previous prime is 1997851. The next prime is 1997867. The reversal of 1997854 is 4587991.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1997854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997851) 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 as a sum of consecutive naturals, namely, 499462 + ... + 499465.

It is an arithmetic number, because the mean of its divisors is an integer number (749196).

2^1997854 is an apocalyptic number.

1997854 is a deficient number, since it is larger than the sum of its proper divisors (998930).

1997854 is an equidigital number, since it uses as much as digits as its factorization.

1997854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998929.

The product of its digits is 90720, while the sum is 43.

The square root of 1997854 is about 1413.4546331595. The cubic root of 1997854 is about 125.9470256861.

The spelling of 1997854 in words is "one million, nine hundred ninety-seven thousand, eight hundred fifty-four".