439381 has 2 divisors, whose sum is σ = 439382. Its totient is φ = 439380.

The previous prime is 439367. The next prime is 439409. The reversal of 439381 is 183934.

It is an a-pointer prime, because the next prime (439409) can be obtained adding 439381 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 320356 + 119025 = 566^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 439381 - 2⁵ = 439349 is a prime.

It is a super-2 number, since 2×439381² = 386111326322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219690 + 219691.

It is an arithmetic number, because the mean of its divisors is an integer number (219691).

2⁴³⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

439381 is a deficient number, since it is larger than the sum of its proper divisors (1).

439381 is an equidigital number, since it uses as much as digits as its factorization.

439381 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 439381 is about 662.8582050484. The cubic root of 439381 is about 76.0233653920.

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

The spelling of 439381 in words is "four hundred thirty-nine thousand, three hundred eighty-one".