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1228221 = 32239571
BaseRepresentation
bin100101011110110111101
32022101210200
410223312331
5303300341
642154113
713303551
oct4536675
92271720
101228221
11769865
124b2939
13340077
1423d861
15193db6
hex12bdbd

1228221 has 12 divisors (see below), whose sum is σ = 1784640. Its totient is φ = 813960.

The previous prime is 1228219. The next prime is 1228243.

It is a happy number.

1228221 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1228221 - 21 = 1228219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228194 and 1228203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1866 + ... + 2436.

It is an arithmetic number, because the mean of its divisors is an integer number (148720).

21228221 is an apocalyptic number.

It is an amenable number.

1228221 is a deficient number, since it is larger than the sum of its proper divisors (556419).

1228221 is a wasteful number, since it uses less digits than its factorization.

1228221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 813 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 1228221 is about 1108.2513252868. The cubic root of 1228221 is about 107.0924463807.

The spelling of 1228221 in words is "one million, two hundred twenty-eight thousand, two hundred twenty-one".

Divisors: 1 3 9 239 571 717 1713 2151 5139 136469 409407 1228221