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1047 = 3349

1047 has 4 divisors (see below), whose sum is σ = 1400. Its totient is φ = 696.

The previous prime is 1039. The next prime is 1049. The reversal of 1047 is 7401.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7401 = 32467.

It is not a de Polignac number, because 1047 - 23 = 1039 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a nialpdrome in base 11 and base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172 + ... + 177.

It is an arithmetic number, because the mean of its divisors is an integer number (350).

1047 is a deficient number, since it is larger than the sum of its proper divisors (353).

1047 is an equidigital number, since it uses as much as digits as its factorization.

1047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 28, while the sum is 12.

The square root of 1047 is about 32.3573793747. The cubic root of 1047 is about 10.1542743692.

Subtracting from 1047 its sum of digits (12), we obtain a triangular number (1035 = T45).

Adding to 1047 its reverse (7401), we get a palindrome (8448).

It can be divided in two parts, 104 and 7, that added together give a palindrome (111).

The spelling of 1047 in words is "one thousand, forty-seven", and thus it is an iban number.

Divisors: 1 3 349 1047