1280819 has 4 divisors (see below), whose sum is σ = 1283640. Its totient is φ = 1278000.

The previous prime is 1280803. The next prime is 1280821. The reversal of 1280819 is 9180821.

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 1280819 - 2⁴ = 1280803 is a prime.

It is a super-2 number, since 2×1280819² = 3280994621522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1280791 and 1280800.

It is not an unprimeable number, because it can be changed into a prime (1280869) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 557 + ... + 1694.

It is an arithmetic number, because the mean of its divisors is an integer number (320910).

2^1280819 is an apocalyptic number.

1280819 is a deficient number, since it is larger than the sum of its proper divisors (2821).

1280819 is an equidigital number, since it uses as much as digits as its factorization.

1280819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2820.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1280819 is about 1131.7327423027. The cubic root of 1280819 is about 108.5998571018.

The spelling of 1280819 in words is "one million, two hundred eighty thousand, eight hundred nineteen".