1666270 has 8 divisors (see below), whose sum is σ = 2999304. Its totient is φ = 666504.

The previous prime is 1666261. The next prime is 1666271. The reversal of 1666270 is 726661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666271) by changing a digit.

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, 83304 + ... + 83323.

It is an arithmetic number, because the mean of its divisors is an integer number (374913).

2^1666270 is an apocalyptic number.

1666270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666270 is a deficient number, since it is larger than the sum of its proper divisors (1333034).

1666270 is a wasteful number, since it uses less digits than its factorization.

1666270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166634.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1666270 is about 1290.8408112544. The cubic root of 1666270 is about 118.5537033966.

It can be divided in two parts, 1666 and 270, that added together give a square (1936 = 44²).

The spelling of 1666270 in words is "one million, six hundred sixty-six thousand, two hundred seventy".