1381439 has 2 divisors, whose sum is σ = 1381440. Its totient is φ = 1381438.

The previous prime is 1381427. The next prime is 1381441. The reversal of 1381439 is 9341831.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381439 is a prime.

Together with 1381441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1381409) 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, 690719 + 690720.

It is an arithmetic number, because the mean of its divisors is an integer number (690720).

2^1381439 is an apocalyptic number.

1381439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1381439 is an equidigital number, since it uses as much as digits as its factorization.

1381439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 1381439 is about 1175.3463319380. The cubic root of 1381439 is about 111.3723125572.

The spelling of 1381439 in words is "one million, three hundred eighty-one thousand, four hundred thirty-nine".