1966603 has 2 divisors, whose sum is σ = 1966604. Its totient is φ = 1966602.

The previous prime is 1966597. The next prime is 1966607. The reversal of 1966603 is 3066691.

It is a strong prime.

It is an emirp because it is prime and its reverse (3066691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1966603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1966607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983301 + 983302.

It is an arithmetic number, because the mean of its divisors is an integer number (983302).

2^1966603 is an apocalyptic number.

1966603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966603 is an equidigital number, since it uses as much as digits as its factorization.

1966603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 1966603 is about 1402.3562314904. The cubic root of 1966603 is about 125.2868717996.

The spelling of 1966603 in words is "one million, nine hundred sixty-six thousand, six hundred three".