1966647 has 16 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 1252800.

The previous prime is 1966619. The next prime is 1966663. The reversal of 1966647 is 7466691.

It is not a de Polignac number, because 1966647 - 2⁶ = 1966583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7122 + ... + 7392.

It is an arithmetic number, because the mean of its divisors is an integer number (171360).

2^1966647 is an apocalyptic number.

1966647 is a deficient number, since it is larger than the sum of its proper divisors (775113).

1966647 is a wasteful number, since it uses less digits than its factorization.

1966647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374.

The product of its digits is 54432, while the sum is 39.

The square root of 1966647 is about 1402.3719192853. The cubic root of 1966647 is about 125.2878061656.

It can be divided in two parts, 19 and 66647, that added together give a palindrome (66666).

The spelling of 1966647 in words is "one million, nine hundred sixty-six thousand, six hundred forty-seven".