1280558 has 4 divisors (see below), whose sum is σ = 1920840. Its totient is φ = 640278.

The previous prime is 1280549. The next prime is 1280561. The reversal of 1280558 is 8550821.

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

It is a super-3 number, since 3×1280558³ = 6299687632234503336, which contains 333 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1280558.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320138 + ... + 320141.

It is an arithmetic number, because the mean of its divisors is an integer number (480210).

2^1280558 is an apocalyptic number.

1280558 is a deficient number, since it is larger than the sum of its proper divisors (640282).

1280558 is an equidigital number, since it uses as much as digits as its factorization.

1280558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640281.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 1280558 is about 1131.6174265183. The cubic root of 1280558 is about 108.5924799241.

The spelling of 1280558 in words is "one million, two hundred eighty thousand, five hundred fifty-eight".