1666497 has 8 divisors (see below), whose sum is σ = 2539456. Its totient is φ = 952272.

The previous prime is 1666487. The next prime is 1666499. The reversal of 1666497 is 7946661.

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

It is not a de Polignac number, because 1666497 - 2⁴ = 1666481 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 39658 + ... + 39699.

It is an arithmetic number, because the mean of its divisors is an integer number (317432).

2^1666497 is an apocalyptic number.

It is an amenable number.

1666497 is a deficient number, since it is larger than the sum of its proper divisors (872959).

1666497 is an equidigital number, since it uses as much as digits as its factorization.

1666497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79367.

The product of its digits is 54432, while the sum is 39.

The square root of 1666497 is about 1290.9287354459. The cubic root of 1666497 is about 118.5590867716.

It can be divided in two parts, 16664 and 97, that added together give a palindrome (16761).

The spelling of 1666497 in words is "one million, six hundred sixty-six thousand, four hundred ninety-seven".