1997975 has 24 divisors (see below), whose sum is σ = 2901600. Its totient is φ = 1364160.

The previous prime is 1997969. The next prime is 1997999. The reversal of 1997975 is 5797991.

It is a happy number.

It is not a de Polignac number, because 1997975 - 2⁶ = 1997911 is a prime.

It is an Ulam number.

Its product of digits (178605) is a multiple of the sum of its prime divisors (245).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8459 + ... + 8691.

It is an arithmetic number, because the mean of its divisors is an integer number (120900).

2^1997975 is an apocalyptic number.

1997975 is a deficient number, since it is larger than the sum of its proper divisors (903625).

1997975 is an equidigital number, since it uses as much as digits as its factorization.

1997975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 245 counting only the distinct ones).

The product of its digits is 178605, while the sum is 47.

The square root of 1997975 is about 1413.4974354416. The cubic root of 1997975 is about 125.9495682947.

The spelling of 1997975 in words is "one million, nine hundred ninety-seven thousand, nine hundred seventy-five".