1997728 has 24 divisors (see below), whose sum is σ = 3967488. Its totient is φ = 990144.

The previous prime is 1997719. The next prime is 1997731. The reversal of 1997728 is 8277991.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025 + ... + 5407.

It is an arithmetic number, because the mean of its divisors is an integer number (165312).

2^1997728 is an apocalyptic number.

It is an amenable number.

1997728 is a deficient number, since it is larger than the sum of its proper divisors (1969760).

1997728 is a wasteful number, since it uses less digits than its factorization.

1997728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 548 counting only the distinct ones).

The product of its digits is 63504, while the sum is 43.

The square root of 1997728 is about 1413.4100608104. The cubic root of 1997728 is about 125.9443779018.

The spelling of 1997728 in words is "one million, nine hundred ninety-seven thousand, seven hundred twenty-eight".