1280345 has 8 divisors (see below), whose sum is σ = 1676160. Its totient is φ = 931120.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280345 is 5430821.

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

It is not a de Polignac number, because 1280345 - 2⁶ = 1280281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1280345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11585 + ... + 11694.

It is an arithmetic number, because the mean of its divisors is an integer number (209520).

2^1280345 is an apocalyptic number.

It is an amenable number.

1280345 is a deficient number, since it is larger than the sum of its proper divisors (395815).

1280345 is a wasteful number, since it uses less digits than its factorization.

1280345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23295.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1280345 is about 1131.5233095257. The cubic root of 1280345 is about 108.5864587258.

The spelling of 1280345 in words is "one million, two hundred eighty thousand, three hundred forty-five".