1281445 has 16 divisors (see below), whose sum is σ = 1752192. Its totient is φ = 890560.

The previous prime is 1281439. The next prime is 1281451. The reversal of 1281445 is 5441821.

It is an interprime number because it is at equal distance from previous prime (1281439) and next prime (1281451).

It is not a de Polignac number, because 1281445 - 2⁷ = 1281317 is a prime.

It is a Duffinian number.

1281445 is a lucky number.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 759 + ... + 1771.

It is an arithmetic number, because the mean of its divisors is an integer number (109512).

2^1281445 is an apocalyptic number.

It is an amenable number.

1281445 is a deficient number, since it is larger than the sum of its proper divisors (470747).

1281445 is a wasteful number, since it uses less digits than its factorization.

1281445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052.

The product of its digits is 1280, while the sum is 25.

The square root of 1281445 is about 1132.0092755804. The cubic root of 1281445 is about 108.6175469388.

The spelling of 1281445 in words is "one million, two hundred eighty-one thousand, four hundred forty-five".