1271839 has 2 divisors, whose sum is σ = 1271840. Its totient is φ = 1271838.

The previous prime is 1271833. The next prime is 1271843. The reversal of 1271839 is 9381721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1271839 - 2⁵ = 1271807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1271839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1271833) 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, 635919 + 635920.

It is an arithmetic number, because the mean of its divisors is an integer number (635920).

2^1271839 is an apocalyptic number.

1271839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271839 is an equidigital number, since it uses as much as digits as its factorization.

1271839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1271839 is about 1127.7583961115. The cubic root of 1271839 is about 108.3454587348.

The spelling of 1271839 in words is "one million, two hundred seventy-one thousand, eight hundred thirty-nine".