1997853 has 16 divisors (see below), whose sum is σ = 3130176. Its totient is φ = 1117440.

The previous prime is 1997851. The next prime is 1997867. The reversal of 1997853 is 3587991.

It is a happy number.

It is not a de Polignac number, because 1997853 - 2¹ = 1997851 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 1900 + ... + 2757.

It is an arithmetic number, because the mean of its divisors is an integer number (195636).

2^1997853 is an apocalyptic number.

1997853 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1997853 is a deficient number, since it is larger than the sum of its proper divisors (1132323).

1997853 is a wasteful number, since it uses less digits than its factorization.

1997853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4684.

The product of its digits is 68040, while the sum is 42.

The square root of 1997853 is about 1413.4542794162. The cubic root of 1997853 is about 125.9470046723.

It can be divided in two parts, 1997 and 853, that added together give a triangular number (2850 = T₇₅).

The spelling of 1997853 in words is "one million, nine hundred ninety-seven thousand, eight hundred fifty-three".