1997812 has 24 divisors (see below), whose sum is σ = 3731840. Its totient is φ = 933120.

The previous prime is 1997773. The next prime is 1997813. The reversal of 1997812 is 2187991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7237 + ... + 7507.

2^1997812 is an apocalyptic number.

It is an amenable number.

1997812 is a deficient number, since it is larger than the sum of its proper divisors (1734028).

1997812 is a wasteful number, since it uses less digits than its factorization.

1997812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 389 counting only the distinct ones).

The product of its digits is 9072, while the sum is 37.

The square root of 1997812 is about 1413.4397758660. The cubic root of 1997812 is about 125.9461431037.

It can be divided in two parts, 1997 and 812, that added together give a square (2809 = 53²).

The spelling of 1997812 in words is "one million, nine hundred ninety-seven thousand, eight hundred twelve".