1690043 has 2 divisors, whose sum is σ = 1690044. Its totient is φ = 1690042.

The previous prime is 1690019. The next prime is 1690057. The reversal of 1690043 is 3400961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1690043 - 2¹⁶ = 1624507 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (1692043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 845021 + 845022.

It is an arithmetic number, because the mean of its divisors is an integer number (845022).

2^1690043 is an apocalyptic number.

1690043 is a deficient number, since it is larger than the sum of its proper divisors (1).

1690043 is an equidigital number, since it uses as much as digits as its factorization.

1690043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1690043 is about 1300.0165383563. The cubic root of 1690043 is about 119.1148527468.

The spelling of 1690043 in words is "one million, six hundred ninety thousand, forty-three".