1288355 has 4 divisors (see below), whose sum is σ = 1546032. Its totient is φ = 1030680.

The previous prime is 1288349. The next prime is 1288361. The reversal of 1288355 is 5538821.

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: 5538821 = 17 ⋅325813.

It is an interprime number because it is at equal distance from previous prime (1288349) and next prime (1288361).

It is not a de Polignac number, because 1288355 - 2⁶ = 1288291 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128831 + ... + 128840.

It is an arithmetic number, because the mean of its divisors is an integer number (386508).

2^1288355 is an apocalyptic number.

1288355 is a deficient number, since it is larger than the sum of its proper divisors (257677).

1288355 is an equidigital number, since it uses as much as digits as its factorization.

1288355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257676.

The product of its digits is 9600, while the sum is 32.

The square root of 1288355 is about 1135.0572672777. The cubic root of 1288355 is about 108.8124316731.

The spelling of 1288355 in words is "one million, two hundred eighty-eight thousand, three hundred fifty-five".