1690669 has 2 divisors, whose sum is σ = 1690670. Its totient is φ = 1690668.

The previous prime is 1690651. The next prime is 1690673. The reversal of 1690669 is 9660961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 26569 = 1290^2 + 163^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690669 - 2¹³ = 1682477 is a prime.

It is a super-2 number, since 2×1690669² = 5716723335122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1690609) 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, 845334 + 845335.

It is an arithmetic number, because the mean of its divisors is an integer number (845335).

2^1690669 is an apocalyptic number.

It is an amenable number.

1690669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690669 is an equidigital number, since it uses as much as digits as its factorization.

1690669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 1690669 is about 1300.2572822330. The cubic root of 1690669 is about 119.1295578348.

The spelling of 1690669 in words is "one million, six hundred ninety thousand, six hundred sixty-nine".