1281338 has 4 divisors (see below), whose sum is σ = 1922010. Its totient is φ = 640668.

The previous prime is 1281331. The next prime is 1281349. The reversal of 1281338 is 8331821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8331821 = 509 ⋅16369.

It can be written as a sum of positive squares in only one way, i.e., 1014049 + 267289 = 1007^2 + 517^2 .

It is not an unprimeable number, because it can be changed into a prime (1281331) 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 as a sum of consecutive naturals, namely, 320333 + ... + 320336.

2^1281338 is an apocalyptic number.

1281338 is a deficient number, since it is larger than the sum of its proper divisors (640672).

1281338 is an equidigital number, since it uses as much as digits as its factorization.

1281338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640671.

The product of its digits is 1152, while the sum is 26.

The square root of 1281338 is about 1131.9620134969. The cubic root of 1281338 is about 108.6145236848.

The spelling of 1281338 in words is "one million, two hundred eighty-one thousand, three hundred thirty-eight".