1288445 has 4 divisors (see below), whose sum is σ = 1546140. Its totient is φ = 1030752.

The previous prime is 1288439. The next prime is 1288487. The reversal of 1288445 is 5448821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5448821 = 7 ⋅778403.

It can be written as a sum of positive squares in 2 ways, for example, as 737881 + 550564 = 859^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288445 - 2⁴ = 1288429 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128840 + ... + 128849.

It is an arithmetic number, because the mean of its divisors is an integer number (386535).

2^1288445 is an apocalyptic number.

It is an amenable number.

1288445 is a deficient number, since it is larger than the sum of its proper divisors (257695).

1288445 is an equidigital number, since it uses as much as digits as its factorization.

1288445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257694.

The product of its digits is 10240, while the sum is 32.

The square root of 1288445 is about 1135.0969121621. The cubic root of 1288445 is about 108.8149653668.

The spelling of 1288445 in words is "one million, two hundred eighty-eight thousand, four hundred forty-five".