1666498 has 8 divisors (see below), whose sum is σ = 2580480. Its totient is φ = 806340.

The previous prime is 1666487. The next prime is 1666499. The reversal of 1666498 is 8946661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666498.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13378 + ... + 13501.

It is an arithmetic number, because the mean of its divisors is an integer number (322560).

2^1666498 is an apocalyptic number.

1666498 is a deficient number, since it is larger than the sum of its proper divisors (913982).

1666498 is a wasteful number, since it uses less digits than its factorization.

1666498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26912.

The product of its digits is 62208, while the sum is 40.

The square root of 1666498 is about 1290.9291227639. The cubic root of 1666498 is about 118.5591104858.

The spelling of 1666498 in words is "one million, six hundred sixty-six thousand, four hundred ninety-eight".