1690166 has 4 divisors (see below), whose sum is σ = 2535252. Its totient is φ = 845082.

The previous prime is 1690153. The next prime is 1690187. The reversal of 1690166 is 6610961.

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

It is a super-2 number, since 2×1690166² = 5713322215112, which contains 22 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 (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422540 + ... + 422543.

It is an arithmetic number, because the mean of its divisors is an integer number (633813).

2^1690166 is an apocalyptic number.

1690166 is a deficient number, since it is larger than the sum of its proper divisors (845086).

1690166 is an equidigital number, since it uses as much as digits as its factorization.

1690166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845085.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 1690166 is about 1300.0638445861. The cubic root of 1690166 is about 119.1177423718.

The spelling of 1690166 in words is "one million, six hundred ninety thousand, one hundred sixty-six".