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1272749 is a prime number
BaseRepresentation
bin100110110101110101101
32101122212212
410312232231
5311211444
643140205
713550432
oct4665655
92348785
101272749
1179a265
12514665
1335740a
14251b89
151a219e
hex136bad

1272749 has 2 divisors, whose sum is σ = 1272750. Its totient is φ = 1272748.

The previous prime is 1272679. The next prime is 1272811. The reversal of 1272749 is 9472721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1087849 + 184900 = 1043^2 + 430^2 .

It is an emirp because it is prime and its reverse (9472721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-1272749 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a lonely number, since its distance to closest prime (1272811) sets a new record.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1272049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636374 + 636375.

It is an arithmetic number, because the mean of its divisors is an integer number (636375).

21272749 is an apocalyptic number.

It is an amenable number.

1272749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1272749 is an equidigital number, since it uses as much as digits as its factorization.

1272749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 1272749 is about 1128.1617791789. The cubic root of 1272749 is about 108.3712929434.

The spelling of 1272749 in words is "one million, two hundred seventy-two thousand, seven hundred forty-nine".