1745649 has 12 divisors (see below), whose sum is σ = 2556996. Its totient is φ = 1147392.

The previous prime is 1745647. The next prime is 1745669. The reversal of 1745649 is 9465471.

1745649 is a `hidden beast` number, since 1 + 7 + 4 + 5 + 649 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1065024 + 680625 = 1032^2 + 825^2 .

It is not a de Polignac number, because 1745649 - 2¹ = 1745647 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1745647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 672 + ... + 1985.

It is an arithmetic number, because the mean of its divisors is an integer number (213083).

2^1745649 is an apocalyptic number.

It is an amenable number.

1745649 is a deficient number, since it is larger than the sum of its proper divisors (811347).

1745649 is a wasteful number, since it uses less digits than its factorization.

1745649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2733 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 1745649 is about 1321.2301086488. The cubic root of 1745649 is about 120.4071586197.

The spelling of 1745649 in words is "one million, seven hundred forty-five thousand, six hundred forty-nine".