1690006 has 4 divisors (see below), whose sum is σ = 2535012. Its totient is φ = 845002.

The previous prime is 1689967. The next prime is 1690009. The reversal of 1690006 is 6000961.

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

It is a super-2 number, since 2×1690006² = 5712240560072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690009) 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 as a sum of consecutive naturals, namely, 422500 + ... + 422503.

It is an arithmetic number, because the mean of its divisors is an integer number (633753).

2^1690006 is an apocalyptic number.

1690006 is a deficient number, since it is larger than the sum of its proper divisors (845006).

1690006 is an equidigital number, since it uses as much as digits as its factorization.

1690006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845005.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1690006 is about 1300.0023076903. The cubic root of 1690006 is about 119.1139834826.

Adding to 1690006 its reverse (6000961), we get a palindrome (7690967).

The spelling of 1690006 in words is "one million, six hundred ninety thousand, six".