1280395 has 4 divisors (see below), whose sum is σ = 1536480. Its totient is φ = 1024312.

The previous prime is 1280371. The next prime is 1280399. The reversal of 1280395 is 5930821.

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

It is a cyclic number.

It is not a de Polignac number, because 1280395 - 2⁷ = 1280267 is a prime.

It is a super-2 number, since 2×1280395² = 3278822712050, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1280399) 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, 128035 + ... + 128044.

It is an arithmetic number, because the mean of its divisors is an integer number (384120).

2^1280395 is an apocalyptic number.

1280395 is a deficient number, since it is larger than the sum of its proper divisors (256085).

1280395 is an equidigital number, since it uses as much as digits as its factorization.

1280395 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256084.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 1280395 is about 1131.5454034196. The cubic root of 1280395 is about 108.5878722126.

The spelling of 1280395 in words is "one million, two hundred eighty thousand, three hundred ninety-five".