1966417 has 2 divisors, whose sum is σ = 1966418. Its totient is φ = 1966416.

The previous prime is 1966409. The next prime is 1966427. The reversal of 1966417 is 7146691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1957201 + 9216 = 1399^2 + 96^2 .

It is an emirp because it is prime and its reverse (7146691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966417 - 2³ = 1966409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1966427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983208 + 983209.

It is an arithmetic number, because the mean of its divisors is an integer number (983209).

2^1966417 is an apocalyptic number.

It is an amenable number.

1966417 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966417 is an equidigital number, since it uses as much as digits as its factorization.

1966417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 1966417 is about 1402.2899129638. The cubic root of 1966417 is about 125.2829218255.

The spelling of 1966417 in words is "one million, nine hundred sixty-six thousand, four hundred seventeen".