1280365 has 8 divisors (see below), whose sum is σ = 1546848. Its totient is φ = 1017360.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280365 is 5630821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1280365 - 2⁵ = 1280333 is a prime.

It is an Ulam number.

It is a Duffinian number.

1280365 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30 + ... + 1600.

It is an arithmetic number, because the mean of its divisors is an integer number (193356).

2^1280365 is an apocalyptic number.

It is an amenable number.

1280365 is a deficient number, since it is larger than the sum of its proper divisors (266483).

1280365 is a wasteful number, since it uses less digits than its factorization.

1280365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1739.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 1280365 is about 1131.5321471350. The cubic root of 1280365 is about 108.5870241250.

The spelling of 1280365 in words is "one million, two hundred eighty thousand, three hundred sixty-five".