1201765 has 4 divisors (see below), whose sum is σ = 1442124. Its totient is φ = 961408.

The previous prime is 1201729. The next prime is 1201787. The reversal of 1201765 is 5671021.

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

It can be written as a sum of positive squares in 2 ways, for example, as 863041 + 338724 = 929^2 + 582^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201765 - 2⁷ = 1201637 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 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, 120172 + ... + 120181.

It is an arithmetic number, because the mean of its divisors is an integer number (360531).

2^1201765 is an apocalyptic number.

It is an amenable number.

1201765 is a deficient number, since it is larger than the sum of its proper divisors (240359).

1201765 is an equidigital number, since it uses as much as digits as its factorization.

1201765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240358.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1201765 is about 1096.2504275940. The cubic root of 1201765 is about 106.3179311839.

Adding to 1201765 its reverse (5671021), we get a palindrome (6872786).

The spelling of 1201765 in words is "one million, two hundred one thousand, seven hundred sixty-five".