1280458 has 4 divisors (see below), whose sum is σ = 1920690. Its totient is φ = 640228.

The previous prime is 1280453. The next prime is 1280473. The reversal of 1280458 is 8540821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8540821 = 37 ⋅230833.

It can be written as a sum of positive squares in only one way, i.e., 840889 + 439569 = 917^2 + 663^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1280453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320113 + ... + 320116.

2^1280458 is an apocalyptic number.

1280458 is a deficient number, since it is larger than the sum of its proper divisors (640232).

1280458 is an equidigital number, since it uses as much as digits as its factorization.

1280458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640231.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 1280458 is about 1131.5732411117. The cubic root of 1280458 is about 108.5896531536.

The spelling of 1280458 in words is "one million, two hundred eighty thousand, four hundred fifty-eight".