1280165 has 4 divisors (see below), whose sum is σ = 1536204. Its totient is φ = 1024128.

The previous prime is 1280161. The next prime is 1280173. The reversal of 1280165 is 5610821.

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 160801 + 1119364 = 401^2 + 1058^2 .

It is a cyclic number.

It is not a de Polignac number, because 1280165 - 2² = 1280161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128012 + ... + 128021.

It is an arithmetic number, because the mean of its divisors is an integer number (384051).

2^1280165 is an apocalyptic number.

It is an amenable number.

1280165 is a deficient number, since it is larger than the sum of its proper divisors (256039).

1280165 is an equidigital number, since it uses as much as digits as its factorization.

1280165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256038.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1280165 is about 1131.4437679355. The cubic root of 1280165 is about 108.5813698686.

Adding to 1280165 its reverse (5610821), we get a palindrome (6890986).

The spelling of 1280165 in words is "one million, two hundred eighty thousand, one hundred sixty-five".