1997953 has 4 divisors (see below), whose sum is σ = 2015748. Its totient is φ = 1980160.

The previous prime is 1997939. The next prime is 1997969. The reversal of 1997953 is 3597991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 223729 + 1774224 = 473^2 + 1332^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997953 - 2⁵ = 1997921 is a prime.

It is a Duffinian number.

1997953 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1997903) 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, 8728 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (503937).

2^1997953 is an apocalyptic number.

It is an amenable number.

1997953 is a deficient number, since it is larger than the sum of its proper divisors (17795).

1997953 is a wasteful number, since it uses less digits than its factorization.

1997953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17794.

The product of its digits is 76545, while the sum is 43.

The square root of 1997953 is about 1413.4896533049. The cubic root of 1997953 is about 125.9491060098.

The spelling of 1997953 in words is "one million, nine hundred ninety-seven thousand, nine hundred fifty-three".