1288221 has 16 divisors (see below), whose sum is σ = 1896960. Its totient is φ = 771120.

The previous prime is 1288213. The next prime is 1288247. The reversal of 1288221 is 1228821.

It is not a de Polignac number, because 1288221 - 2³ = 1288213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1288191 and 1288200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3210 + ... + 3588.

It is an arithmetic number, because the mean of its divisors is an integer number (118560).

2^1288221 is an apocalyptic number.

1288221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1288221 is a deficient number, since it is larger than the sum of its proper divisors (608739).

1288221 is a wasteful number, since it uses less digits than its factorization.

1288221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496.

The product of its digits is 512, while the sum is 24.

The square root of 1288221 is about 1134.9982378841. The cubic root of 1288221 is about 108.8086590661.

The spelling of 1288221 in words is "one million, two hundred eighty-eight thousand, two hundred twenty-one".