408389 has 2 divisors, whose sum is σ = 408390. Its totient is φ = 408388.

The previous prime is 408379. The next prime is 408403. The reversal of 408389 is 983804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 187489 = 470^2 + 433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-408389 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204194 + 204195.

It is an arithmetic number, because the mean of its divisors is an integer number (204195).

2⁴⁰⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

408389 is a deficient number, since it is larger than the sum of its proper divisors (1).

408389 is an equidigital number, since it uses as much as digits as its factorization.

408389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 408389 is about 639.0532059226. The cubic root of 408389 is about 74.1921594532.

It can be divided in two parts, 408 and 389, that added together give a palindrome (797).

The spelling of 408389 in words is "four hundred eight thousand, three hundred eighty-nine".