1666722 has 8 divisors (see below), whose sum is σ = 3333456. Its totient is φ = 555572.

The previous prime is 1666711. The next prime is 1666727. The reversal of 1666722 is 2276661.

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

1666722 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1666722.

It is not an unprimeable number, because it can be changed into a prime (1666727) 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 3 ways as a sum of consecutive naturals, for example, 138888 + ... + 138899.

It is an arithmetic number, because the mean of its divisors is an integer number (416682).

2^1666722 is an apocalyptic number.

1666722 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1666722 is a wasteful number, since it uses less digits than its factorization.

1666722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277792.

The product of its digits is 6048, while the sum is 30.

The square root of 1666722 is about 1291.0158790658. The cubic root of 1666722 is about 118.5644222336.

The spelling of 1666722 in words is "one million, six hundred sixty-six thousand, seven hundred twenty-two".