1205642 has 4 divisors (see below), whose sum is σ = 1808466. Its totient is φ = 602820.

The previous prime is 1205639. The next prime is 1205647. The reversal of 1205642 is 2465021.

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: 2465021 = 13 ⋅189617.

It can be written as a sum of positive squares in only one way, i.e., 1038361 + 167281 = 1019^2 + 409^2 .

It is not an unprimeable number, because it can be changed into a prime (1205647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 301409 + ... + 301412.

2^1205642 is an apocalyptic number.

1205642 is a deficient number, since it is larger than the sum of its proper divisors (602824).

1205642 is an equidigital number, since it uses as much as digits as its factorization.

1205642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602823.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1205642 is about 1098.0173040531. The cubic root of 1205642 is about 106.4321388017.

The spelling of 1205642 in words is "one million, two hundred five thousand, six hundred forty-two".