1280842 has 4 divisors (see below), whose sum is σ = 1921266. Its totient is φ = 640420.

The previous prime is 1280837. The next prime is 1280857. The reversal of 1280842 is 2480821.

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

It can be written as a sum of positive squares in only one way, i.e., 1279161 + 1681 = 1131^2 + 41^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320209 + ... + 320212.

2^1280842 is an apocalyptic number.

1280842 is a deficient number, since it is larger than the sum of its proper divisors (640424).

1280842 is an equidigital number, since it uses as much as digits as its factorization.

1280842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640423.

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 1280842 is about 1131.7429036667. The cubic root of 1280842 is about 108.6005071499.

The spelling of 1280842 in words is "one million, two hundred eighty thousand, eight hundred forty-two".