1997188 has 12 divisors (see below), whose sum is σ = 3512320. Its totient is φ = 993672.

The previous prime is 1997183. The next prime is 1997189. The reversal of 1997188 is 8817991.

It is not an unprimeable number, because it can be changed into a prime (1997183) 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, 228 + ... + 2011.

2^1997188 is an apocalyptic number.

It is an amenable number.

1997188 is a deficient number, since it is larger than the sum of its proper divisors (1515132).

1997188 is a wasteful number, since it uses less digits than its factorization.

1997188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2466 (or 2464 counting only the distinct ones).

The product of its digits is 36288, while the sum is 43.

The square root of 1997188 is about 1413.2190205343. The cubic root of 1997188 is about 125.9330289940.

Adding to 1997188 its product of digits (36288), we get a square (2033476 = 1426²).

The spelling of 1997188 in words is "one million, nine hundred ninety-seven thousand, one hundred eighty-eight".