1966427 has 2 divisors, whose sum is σ = 1966428. Its totient is φ = 1966426.

The previous prime is 1966417. The next prime is 1966429. The reversal of 1966427 is 7246691.

It is a strong prime.

It is an emirp because it is prime and its reverse (7246691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1966427 - 2¹⁴ = 1950043 is a prime.

Together with 1966429, it forms a pair of twin primes.

It is a Chen prime.

It is a d-powerful number, because it can be written as 1 + 9² + 6⁵ + 6⁸ + 4⁹ + 2 + 7⁵ .

It is not a weakly prime, because it can be changed into another prime (1966429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983213 + 983214.

It is an arithmetic number, because the mean of its divisors is an integer number (983214).

2^1966427 is an apocalyptic number.

1966427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966427 is an equidigital number, since it uses as much as digits as its factorization.

1966427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 1966427 is about 1402.2934785558. The cubic root of 1966427 is about 125.2831341960.

It can be divided in two parts, 19664 and 27, that added together give a palindrome (19691).

The spelling of 1966427 in words is "one million, nine hundred sixty-six thousand, four hundred twenty-seven".