1997258 has 4 divisors (see below), whose sum is σ = 2995890. Its totient is φ = 998628.

The previous prime is 1997257. The next prime is 1997267. The reversal of 1997258 is 8527991.

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

It can be written as a sum of positive squares in only one way, i.e., 1408969 + 588289 = 1187^2 + 767^2 .

It is not an unprimeable number, because it can be changed into a prime (1997257) by changing a digit.

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 as a sum of consecutive naturals, namely, 499313 + ... + 499316.

2^1997258 is an apocalyptic number.

1997258 is a deficient number, since it is larger than the sum of its proper divisors (998632).

1997258 is an equidigital number, since it uses as much as digits as its factorization.

1997258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998631.

The product of its digits is 45360, while the sum is 41.

The square root of 1997258 is about 1413.2437864714. The cubic root of 1997258 is about 125.9345002641.

The spelling of 1997258 in words is "one million, nine hundred ninety-seven thousand, two hundred fifty-eight".