1997225 has 6 divisors (see below), whose sum is σ = 2476590. Its totient is φ = 1597760.

The previous prime is 1997213. The next prime is 1997231. The reversal of 1997225 is 5227991.

It can be written as a sum of positive squares in 3 ways, for example, as 3481 + 1993744 = 59^2 + 1412^2 .

It is not a de Polignac number, because 1997225 - 2⁶ = 1997161 is a prime.

It is a d-powerful number, because it can be written as 1 + 9 + 9³ + 7⁴ + 2¹³ + 2¹⁵ + 5⁹ .

It is a plaindrome in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39920 + ... + 39969.

It is an arithmetic number, because the mean of its divisors is an integer number (412765).

2^1997225 is an apocalyptic number.

It is an amenable number.

1997225 is a deficient number, since it is larger than the sum of its proper divisors (479365).

1997225 is an equidigital number, since it uses as much as digits as its factorization.

1997225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79899 (or 79894 counting only the distinct ones).

The product of its digits is 11340, while the sum is 35.

The square root of 1997225 is about 1413.2321111551. The cubic root of 1997225 is about 125.9338066696.

It can be divided in two parts, 1997 and 225, that added together give a palindrome (2222).

The spelling of 1997225 in words is "one million, nine hundred ninety-seven thousand, two hundred twenty-five".