1239 has 8 divisors (see below), whose sum is σ = 1920. Its totient is φ = 696.

The previous prime is 1237. The next prime is 1249. The reversal of 1239 is 9321.

1239 = 2² + 3² + ... + 15².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1239 - 2¹ = 1237 is a prime.

It is a plaindrome in base 10 and base 15.

It is a nialpdrome in base 12 and base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9 + ... + 50.

It is an arithmetic number, because the mean of its divisors is an integer number (240).

1239 is a deficient number, since it is larger than the sum of its proper divisors (681).

1239 is an equidigital number, since it uses as much as digits as its factorization.

1239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69.

The product of its digits is 54, while the sum is 15.

The square root of 1239 is about 35.1994318136. The cubic root of 1239 is about 10.7404819303.

The spelling of 1239 in words is "one thousand, two hundred thirty-nine".