1043645 has 4 divisors (see below), whose sum is σ = 1252380. Its totient is φ = 834912.

The previous prime is 1043639. The next prime is 1043657. The reversal of 1043645 is 5463401.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5463401 = 197 ⋅27733.

It can be written as a sum of positive squares in 2 ways, for example, as 573049 + 470596 = 757^2 + 686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1043645 - 2¹⁴ = 1027261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1043645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104360 + ... + 104369.

It is an arithmetic number, because the mean of its divisors is an integer number (313095).

2^1043645 is an apocalyptic number.

It is an amenable number.

1043645 is a deficient number, since it is larger than the sum of its proper divisors (208735).

1043645 is an equidigital number, since it uses as much as digits as its factorization.

1043645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208734.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1043645 is about 1021.5894478703. The cubic root of 1043645 is about 101.4341666650.

The spelling of 1043645 in words is "one million, forty-three thousand, six hundred forty-five".