1239281 has 2 divisors, whose sum is σ = 1239282. Its totient is φ = 1239280.

The previous prime is 1239269. The next prime is 1239311. The reversal of 1239281 is 1829321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1032256 + 207025 = 1016^2 + 455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1239281 is a prime.

It is a super-2 number, since 2×1239281² = 3071634793922, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1239281.

It is not a weakly prime, because it can be changed into another prime (1239481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619640 + 619641.

It is an arithmetic number, because the mean of its divisors is an integer number (619641).

2^1239281 is an apocalyptic number.

It is an amenable number.

1239281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239281 is an equidigital number, since it uses as much as digits as its factorization.

1239281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

The square root of 1239281 is about 1113.2299852232. The cubic root of 1239281 is about 107.4129383435.

It can be divided in two parts, 12 and 39281, that added together give a palindrome (39293).

The spelling of 1239281 in words is "one million, two hundred thirty-nine thousand, two hundred eighty-one".