381439 has 2 divisors, whose sum is σ = 381440. Its totient is φ = 381438.

The previous prime is 381419. The next prime is 381443. The reversal of 381439 is 934183.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 381439 - 2¹¹ = 379391 is a prime.

381439 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190719 + 190720.

It is an arithmetic number, because the mean of its divisors is an integer number (190720).

2³⁸¹⁴³⁹ is an apocalyptic number.

381439 is a deficient number, since it is larger than the sum of its proper divisors (1).

381439 is an equidigital number, since it uses as much as digits as its factorization.

381439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 381439 is about 617.6074805246. The cubic root of 381439 is about 72.5228782336.

It can be divided in two parts, 381 and 439, that added together give a triangular number (820 = T₄₀).

The spelling of 381439 in words is "three hundred eighty-one thousand, four hundred thirty-nine".