439421 has 2 divisors, whose sum is σ = 439422. Its totient is φ = 439420.

The previous prime is 439409. The next prime is 439427. The reversal of 439421 is 124934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 436921 + 2500 = 661^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 439421 - 2⁶ = 439357 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 4² + 3¹¹ + 4⁹ + 9² + 2⁵ + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (439427) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219710 + 219711.

It is an arithmetic number, because the mean of its divisors is an integer number (219711).

2⁴³⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

439421 is a deficient number, since it is larger than the sum of its proper divisors (1).

439421 is an equidigital number, since it uses as much as digits as its factorization.

439421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 439421 is about 662.8883767272. Note that the first 3 decimals coincide. The cubic root of 439421 is about 76.0256723058.

The spelling of 439421 in words is "four hundred thirty-nine thousand, four hundred twenty-one".