1997455 has 4 divisors (see below), whose sum is σ = 2396952. Its totient is φ = 1597960.

The previous prime is 1997441. The next prime is 1997459. The reversal of 1997455 is 5547991.

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

It is not a de Polignac number, because 1997455 - 2¹³ = 1989263 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199741 + ... + 199750.

It is an arithmetic number, because the mean of its divisors is an integer number (599238).

2^1997455 is an apocalyptic number.

1997455 is a deficient number, since it is larger than the sum of its proper divisors (399497).

1997455 is an equidigital number, since it uses as much as digits as its factorization.

1997455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399496.

The product of its digits is 56700, while the sum is 40.

The square root of 1997455 is about 1413.3134825650. The cubic root of 1997455 is about 125.9386406541.

The spelling of 1997455 in words is "one million, nine hundred ninety-seven thousand, four hundred fifty-five".