1201855 has 4 divisors (see below), whose sum is σ = 1442232. Its totient is φ = 961480.

The previous prime is 1201853. The next prime is 1201873. The reversal of 1201855 is 5581021.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1201855 - 2¹ = 1201853 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120181 + ... + 120190.

It is an arithmetic number, because the mean of its divisors is an integer number (360558).

2^1201855 is an apocalyptic number.

1201855 is a deficient number, since it is larger than the sum of its proper divisors (240377).

1201855 is an equidigital number, since it uses as much as digits as its factorization.

1201855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240376.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1201855 is about 1096.2914758403. The cubic root of 1201855 is about 106.3205851623.

Adding to 1201855 its reverse (5581021), we get a palindrome (6782876).

The spelling of 1201855 in words is "one million, two hundred one thousand, eight hundred fifty-five".