1288417 has 4 divisors (see below), whose sum is σ = 1387540. Its totient is φ = 1189296.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288417 is 7148821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 576081 + 712336 = 759^2 + 844^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1288417 is a prime.

It is a Duffinian number.

1288417 is a lucky number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (1288487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49542 + ... + 49567.

It is an arithmetic number, because the mean of its divisors is an integer number (346885).

2^1288417 is an apocalyptic number.

It is an amenable number.

1288417 is a deficient number, since it is larger than the sum of its proper divisors (99123).

1288417 is an equidigital number, since it uses as much as digits as its factorization.

1288417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99122.

The product of its digits is 3584, while the sum is 31.

The square root of 1288417 is about 1135.0845783465. The cubic root of 1288417 is about 108.8141771192.

The spelling of 1288417 in words is "one million, two hundred eighty-eight thousand, four hundred seventeen".