1288945 has 12 divisors (see below), whose sum is σ = 1799604. Its totient is φ = 883680.

The previous prime is 1288939. The next prime is 1288951. The reversal of 1288945 is 5498821.

It is an interprime number because it is at equal distance from previous prime (1288939) and next prime (1288951).

It can be written as a sum of positive squares in 2 ways, for example, as 717409 + 571536 = 847^2 + 756^2 .

It is not a de Polignac number, because 1288945 - 2⁷ = 1288817 is a prime.

It is a super-2 number, since 2×1288945² = 3322758426050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2386 + ... + 2875.

It is an arithmetic number, because the mean of its divisors is an integer number (149967).

2^1288945 is an apocalyptic number.

It is an amenable number.

1288945 is a deficient number, since it is larger than the sum of its proper divisors (510659).

1288945 is an equidigital number, since it uses as much as digits as its factorization.

1288945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280 (or 5273 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 1288945 is about 1135.3171363104. The cubic root of 1288945 is about 108.8290392948.

The spelling of 1288945 in words is "one million, two hundred eighty-eight thousand, nine hundred forty-five".