1280369 has 4 divisors (see below), whose sum is σ = 1284096. Its totient is φ = 1276644.

The previous prime is 1280333. The next prime is 1280371. The reversal of 1280369 is 9630821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1280369 - 2⁸ = 1280113 is a prime.

It is a super-2 number, since 2×1280369² = 3278689552322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1280309) 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, 1289 + ... + 2054.

It is an arithmetic number, because the mean of its divisors is an integer number (321024).

2^1280369 is an apocalyptic number.

It is an amenable number.

1280369 is a deficient number, since it is larger than the sum of its proper divisors (3727).

1280369 is an equidigital number, since it uses as much as digits as its factorization.

1280369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1280369 is about 1131.5339146486. The cubic root of 1280369 is about 108.5871372041.

The spelling of 1280369 in words is "one million, two hundred eighty thousand, three hundred sixty-nine".