1280738 has 4 divisors (see below), whose sum is σ = 1921110. Its totient is φ = 640368.

The previous prime is 1280737. The next prime is 1280743. The reversal of 1280738 is 8370821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8370821 = 29 ⋅288649.

It can be written as a sum of positive squares in only one way, i.e., 1270129 + 10609 = 1127^2 + 103^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1280738.

It is not an unprimeable number, because it can be changed into a prime (1280737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320183 + ... + 320186.

2^1280738 is an apocalyptic number.

1280738 is a deficient number, since it is larger than the sum of its proper divisors (640372).

1280738 is an equidigital number, since it uses as much as digits as its factorization.

1280738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640371.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1280738 is about 1131.6969559029. The cubic root of 1280738 is about 108.5975677401.

The spelling of 1280738 in words is "one million, two hundred eighty thousand, seven hundred thirty-eight".