1997109 has 32 divisors (see below), whose sum is σ = 3312000. Its totient is φ = 1181952.

The previous prime is 1997101. The next prime is 1997111. The reversal of 1997109 is 9017991.

It is not a de Polignac number, because 1997109 - 2³ = 1997101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997101) 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 31 ways as a sum of consecutive naturals, for example, 8607 + ... + 8835.

It is an arithmetic number, because the mean of its divisors is an integer number (103500).

2^1997109 is an apocalyptic number.

1997109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1997109 is a deficient number, since it is larger than the sum of its proper divisors (1314891).

1997109 is a wasteful number, since it uses less digits than its factorization.

1997109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 1997109 is about 1413.1910698840. The cubic root of 1997109 is about 125.9313685193.

The spelling of 1997109 in words is "one million, nine hundred ninety-seven thousand, one hundred nine".