1203646 has 4 divisors (see below), whose sum is σ = 1805472. Its totient is φ = 601822.

The previous prime is 1203641. The next prime is 1203661. The reversal of 1203646 is 6463021.

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

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 an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203641) 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 as a sum of consecutive naturals, namely, 300910 + ... + 300913.

It is an arithmetic number, because the mean of its divisors is an integer number (451368).

2^1203646 is an apocalyptic number.

1203646 is a deficient number, since it is larger than the sum of its proper divisors (601826).

1203646 is an equidigital number, since it uses as much as digits as its factorization.

1203646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601825.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1203646 is about 1097.1080165599. The cubic root of 1203646 is about 106.3733718014.

Adding to 1203646 its reverse (6463021), we get a palindrome (7666667).

It can be divided in two parts, 1203 and 646, that added together give a square (1849 = 43²).

The spelling of 1203646 in words is "one million, two hundred three thousand, six hundred forty-six".