1668506 has 8 divisors (see below), whose sum is σ = 2860320. Its totient is φ = 715068.

The previous prime is 1668503. The next prime is 1668509. The reversal of 1668506 is 6058661.

It is an interprime number because it is at equal distance from previous prime (1668503) and next prime (1668509).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1668503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59576 + ... + 59603.

It is an arithmetic number, because the mean of its divisors is an integer number (357540).

2^1668506 is an apocalyptic number.

1668506 is a deficient number, since it is larger than the sum of its proper divisors (1191814).

1668506 is a wasteful number, since it uses less digits than its factorization.

1668506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119188.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1668506 is about 1291.7066230379. The cubic root of 1668506 is about 118.6067095310.

The spelling of 1668506 in words is "one million, six hundred sixty-eight thousand, five hundred six".