1288641 has 4 divisors (see below), whose sum is σ = 1718192. Its totient is φ = 859092.

The previous prime is 1288613. The next prime is 1288643. The reversal of 1288641 is 1468821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1288641 - 2⁷ = 1288513 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1288599 and 1288608.

It is not an unprimeable number, because it can be changed into a prime (1288643) 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, 214771 + ... + 214776.

It is an arithmetic number, because the mean of its divisors is an integer number (429548).

2^1288641 is an apocalyptic number.

It is an amenable number.

1288641 is a deficient number, since it is larger than the sum of its proper divisors (429551).

1288641 is an equidigital number, since it uses as much as digits as its factorization.

1288641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429550.

The product of its digits is 3072, while the sum is 30.

The square root of 1288641 is about 1135.1832451195. The cubic root of 1288641 is about 108.8204827804.

The spelling of 1288641 in words is "one million, two hundred eighty-eight thousand, six hundred forty-one".