1666922 has 4 divisors (see below), whose sum is σ = 2500386. Its totient is φ = 833460.

The previous prime is 1666919. The next prime is 1666933. The reversal of 1666922 is 2296661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1164241 + 502681 = 1079^2 + 709^2 .

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 as a sum of consecutive naturals, namely, 416729 + ... + 416732.

2^1666922 is an apocalyptic number.

1666922 is a deficient number, since it is larger than the sum of its proper divisors (833464).

1666922 is an equidigital number, since it uses as much as digits as its factorization.

1666922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833463.

The product of its digits is 7776, while the sum is 32.

The square root of 1666922 is about 1291.0933351234. The cubic root of 1666922 is about 118.5691644633.

The spelling of 1666922 in words is "one million, six hundred sixty-six thousand, nine hundred twenty-two".