1660198 has 4 divisors (see below), whose sum is σ = 2490300. Its totient is φ = 830098.

The previous prime is 1660189. The next prime is 1660199. The reversal of 1660198 is 8910661.

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: 8910661 = 151 ⋅59011.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

1660198 is a modest number, since divided by 198 gives 166 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1660199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 415048 + ... + 415051.

It is an arithmetic number, because the mean of its divisors is an integer number (622575).

2^1660198 is an apocalyptic number.

1660198 is a deficient number, since it is larger than the sum of its proper divisors (830102).

1660198 is an equidigital number, since it uses as much as digits as its factorization.

1660198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830101.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1660198 is about 1288.4867092834. The cubic root of 1660198 is about 118.4095222284.

The spelling of 1660198 in words is "one million, six hundred sixty thousand, one hundred ninety-eight".