1200645 has 12 divisors (see below), whose sum is σ = 2081196. Its totient is φ = 640320.

The previous prime is 1200643. The next prime is 1200673. The reversal of 1200645 is 5460021.

It is a happy number.

1200645 is a `hidden beast` number, since 1 + 20 + 0 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 123201 + 1077444 = 351^2 + 1038^2 .

It is not a de Polignac number, because 1200645 - 2¹ = 1200643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13296 + ... + 13385.

It is an arithmetic number, because the mean of its divisors is an integer number (173433).

2^1200645 is an apocalyptic number.

1200645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1200645 is a deficient number, since it is larger than the sum of its proper divisors (880551).

1200645 is a wasteful number, since it uses less digits than its factorization.

1200645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26692 (or 26689 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1200645 is about 1095.7394763355. The cubic root of 1200645 is about 106.2848928074.

Adding to 1200645 its reverse (5460021), we get a palindrome (6660666).

The spelling of 1200645 in words is "one million, two hundred thousand, six hundred forty-five".