1997712 has 30 divisors (see below), whose sum is σ = 5591222. Its totient is φ = 665856.

The previous prime is 1997707. The next prime is 1997713. The reversal of 1997712 is 2177991.

It can be written as a sum of positive squares in only one way, i.e., 1679616 + 318096 = 1296^2 + 564^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1997713) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6793 + ... + 7080.

2^1997712 is an apocalyptic number.

1997712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1997712 is an abundant number, since it is smaller than the sum of its proper divisors (3593510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1997712 is a wasteful number, since it uses less digits than its factorization.

1997712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13878 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1997712 is about 1413.4044007290. The cubic root of 1997712 is about 125.9440416673.

The spelling of 1997712 in words is "one million, nine hundred ninety-seven thousand, seven hundred twelve".