1289281 has 8 divisors (see below), whose sum is σ = 1496000. Its totient is φ = 1088208.

The previous prime is 1289273. The next prime is 1289287. The reversal of 1289281 is 1829821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1289281 - 2³ = 1289273 is a prime.

It is a super-2 number, since 2×1289281² = 3324490993922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1289287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 906 + ... + 1843.

It is an arithmetic number, because the mean of its divisors is an integer number (187000).

2^1289281 is an apocalyptic number.

It is an amenable number.

1289281 is a deficient number, since it is larger than the sum of its proper divisors (206719).

1289281 is an equidigital number, since it uses as much as digits as its factorization.

1289281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823.

The product of its digits is 2304, while the sum is 31.

The square root of 1289281 is about 1135.4651029424. The cubic root of 1289281 is about 108.8384949298.

It can be divided in two parts, 128 and 9281, that added together give a square (9409 = 97²).

The spelling of 1289281 in words is "one million, two hundred eighty-nine thousand, two hundred eighty-one".