1666666 has 8 divisors (see below), whose sum is σ = 2513664. Its totient is φ = 828780.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666666 is 6666661.

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

1666666 is a modest number, since divided by 6666 gives 166 as remainder.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800 + ... + 2563.

It is an arithmetic number, because the mean of its divisors is an integer number (314208).

2^1666666 is an apocalyptic number.

1666666 is a deficient number, since it is larger than the sum of its proper divisors (846998).

1666666 is a wasteful number, since it uses less digits than its factorization.

1666666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556.

The product of its digits is 46656, while the sum is 37.

The square root of 1666666 is about 1290.9941905369. The cubic root of 1666666 is about 118.5630943413.

It can be divided in two parts, 1666 and 666, that added together give a palindrome (2332).

The spelling of 1666666 in words is "one million, six hundred sixty-six thousand, six hundred sixty-six".