1966749 has 4 divisors (see below), whose sum is σ = 2622336. Its totient is φ = 1311164.

The previous prime is 1966697. The next prime is 1966787. The reversal of 1966749 is 9476691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1966749 - 2⁸ = 1966493 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 1966749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327789 + ... + 327794.

It is an arithmetic number, because the mean of its divisors is an integer number (655584).

2^1966749 is an apocalyptic number.

It is an amenable number.

1966749 is a deficient number, since it is larger than the sum of its proper divisors (655587).

1966749 is an equidigital number, since it uses as much as digits as its factorization.

1966749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655586.

The product of its digits is 81648, while the sum is 42.

The square root of 1966749 is about 1402.4082857713. The cubic root of 1966749 is about 125.2899721424.

The spelling of 1966749 in words is "one million, nine hundred sixty-six thousand, seven hundred forty-nine".