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BaseRepresentation
bin10011011111
31201012
4103133
514442
65435
73431
oct2337
91635
101247
11a34
1287b
1374c
14651
15582
hex4df

1247 has 4 divisors (see below), whose sum is σ = 1320. Its totient is φ = 1176.

The previous prime is 1237. The next prime is 1249. The reversal of 1247 is 7421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7421 = 41181.

It is a cyclic number.

It is not a de Polignac number, because 1247 - 24 = 1231 is a prime.

It is a Duffinian number.

It is a plaindrome in base 8, base 10 and base 16.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8 + ... + 50.

It is an arithmetic number, because the mean of its divisors is an integer number (330).

21247 is an apocalyptic number.

1247 is the 29-th pentagonal number.

1247 is a deficient number, since it is larger than the sum of its proper divisors (73).

1247 is an equidigital number, since it uses as much as digits as its factorization.

1247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72.

The product of its digits is 56, while the sum is 14.

The square root of 1247 is about 35.3128871660. The cubic root of 1247 is about 10.7635488080.

Adding to 1247 its reverse (7421), we get a palindrome (8668).

It can be divided in two parts, 124 and 7, that multiplied together give a palindrome (868).

The spelling of 1247 in words is "one thousand, two hundred forty-seven", and thus it is an iban number.

Divisors: 1 29 43 1247