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1220393 is a prime number
BaseRepresentation
bin100101001111100101001
32022000001202
410221330221
5303023033
642053545
713241666
oct4517451
92260052
101220393
11763999
124aa2b5
13339635
1423aa6d
151918e8
hex129f29

1220393 has 2 divisors, whose sum is σ = 1220394. Its totient is φ = 1220392.

The previous prime is 1220369. The next prime is 1220411. The reversal of 1220393 is 3930221.

1220393 is nontrivially palindromic in base 2.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1024144 + 196249 = 1012^2 + 443^2 .

It is an emirp because it is prime and its reverse (3930221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1220393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1220333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610196 + 610197.

It is an arithmetic number, because the mean of its divisors is an integer number (610197).

21220393 is an apocalyptic number.

It is an amenable number.

1220393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220393 is an equidigital number, since it uses as much as digits as its factorization.

1220393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 1220393 is about 1104.7139901350. The cubic root of 1220393 is about 106.8644453400.

The spelling of 1220393 in words is "one million, two hundred twenty thousand, three hundred ninety-three".