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1221312 = 2636361
BaseRepresentation
bin100101010001011000000
32022001022210
410222023000
5303040222
642102120
713244451
oct4521300
92261283
101221312
11764654
124aa940
13339b91
1423b128
15191d0c
hex12a2c0

1221312 has 28 divisors (see below), whose sum is σ = 3231896. Its totient is φ = 407040.

The previous prime is 1221299. The next prime is 1221373. The reversal of 1221312 is 2131221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2989 + ... + 3372.

21221312 is an apocalyptic number.

1221312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221312 is an abundant number, since it is smaller than the sum of its proper divisors (2010584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221312 is an equidigital number, since it uses as much as digits as its factorization.

1221312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6376 (or 6366 counting only the distinct ones).

The product of its digits is 24, while the sum is 12.

The square root of 1221312 is about 1105.1298566232. The cubic root of 1221312 is about 106.8912628718.

Adding to 1221312 its reverse (2131221), we get a palindrome (3352533).

Subtracting 1221312 from its reverse (2131221), we obtain a palindrome (909909).

The spelling of 1221312 in words is "one million, two hundred twenty-one thousand, three hundred twelve".

Divisors: 1 2 3 4 6 8 12 16 24 32 48 64 96 192 6361 12722 19083 25444 38166 50888 76332 101776 152664 203552 305328 407104 610656 1221312