1662197 has 4 divisors (see below), whose sum is σ = 1666860. Its totient is φ = 1657536.

The previous prime is 1662191. The next prime is 1662211. The reversal of 1662197 is 7912661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7912661 = 1097 ⋅7213.

It can be written as a sum of positive squares in 2 ways, for example, as 421201 + 1240996 = 649^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1662197 - 2¹⁰ = 1661173 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662191) 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 in 3 ways as a sum of consecutive naturals, for example, 1748 + ... + 2525.

It is an arithmetic number, because the mean of its divisors is an integer number (416715).

2^1662197 is an apocalyptic number.

It is an amenable number.

1662197 is a deficient number, since it is larger than the sum of its proper divisors (4663).

1662197 is an equidigital number, since it uses as much as digits as its factorization.

1662197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662.

The product of its digits is 4536, while the sum is 32.

The square root of 1662197 is about 1289.2621921083. The cubic root of 1662197 is about 118.4570277462.

The spelling of 1662197 in words is "one million, six hundred sixty-two thousand, one hundred ninety-seven".