1200655 has 4 divisors (see below), whose sum is σ = 1440792. Its totient is φ = 960520.

The previous prime is 1200643. The next prime is 1200673. The reversal of 1200655 is 5560021.

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: 5560021 = 643 ⋅8647.

It is not a de Polignac number, because 1200655 - 2⁷ = 1200527 is a prime.

It is an Ulam number.

It is a Duffinian number.

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, 120061 + ... + 120070.

It is an arithmetic number, because the mean of its divisors is an integer number (360198).

2^1200655 is an apocalyptic number.

1200655 is a deficient number, since it is larger than the sum of its proper divisors (240137).

1200655 is an equidigital number, since it uses as much as digits as its factorization.

1200655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240136.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1200655 is about 1095.7440394545. The cubic root of 1200655 is about 106.2851878838.

Adding to 1200655 its reverse (5560021), we get a palindrome (6760676).

The spelling of 1200655 in words is "one million, two hundred thousand, six hundred fifty-five".