438989 has 2 divisors, whose sum is σ = 438990. Its totient is φ = 438988.

The previous prime is 438983. The next prime is 439007. The reversal of 438989 is 989834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220900 + 218089 = 470^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 438989 - 2⁸ = 438733 is a prime.

It is a super-2 number, since 2×438989² = 385422684242, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438983) 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, 219494 + 219495.

It is an arithmetic number, because the mean of its divisors is an integer number (219495).

2⁴³⁸⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

438989 is a deficient number, since it is larger than the sum of its proper divisors (1).

438989 is an equidigital number, since it uses as much as digits as its factorization.

438989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 438989 is about 662.5624498868. The cubic root of 438989 is about 76.0007502234. Note that the first 3 decimals are identical.

The spelling of 438989 in words is "four hundred thirty-eight thousand, nine hundred eighty-nine".