1666670 has 8 divisors (see below), whose sum is σ = 3000024. Its totient is φ = 666664.

The previous prime is 1666657. The next prime is 1666711. The reversal of 1666670 is 766661.

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

It is a super-4 number, since 4×1666670⁴ (a number of 26 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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, 83324 + ... + 83343.

It is an arithmetic number, because the mean of its divisors is an integer number (375003).

2^1666670 is an apocalyptic number.

1666670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666670 is a deficient number, since it is larger than the sum of its proper divisors (1333354).

1666670 is a wasteful number, since it uses less digits than its factorization.

1666670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166674.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 1666670 is about 1290.9957397296. The cubic root of 1666670 is about 118.5631891917.

Subtracting from 1666670 its reverse (766661), we obtain a palindrome (900009).

The spelling of 1666670 in words is "one million, six hundred sixty-six thousand, six hundred seventy".