438929989 has 2 divisors, whose sum is σ = 438929990. Its totient is φ = 438929988.

The previous prime is 438929983. The next prime is 438930049. The reversal of 438929989 is 989929834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 342065025 + 96864964 = 18495^2 + 9842^2 .

It is a cyclic number.

It is not a de Polignac number, because 438929989 - 2¹¹ = 438927941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438929983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219464994 + 219464995.

It is an arithmetic number, because the mean of its divisors is an integer number (219464995).

Almost surely, 2^438929989 is an apocalyptic number.

It is an amenable number.

438929989 is a deficient number, since it is larger than the sum of its proper divisors (1).

438929989 is an equidigital number, since it uses as much as digits as its factorization.

438929989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10077696, while the sum is 61.

The square root of 438929989 is about 20950.6560517803. The cubic root of 438929989 is about 759.9734460944.

The spelling of 438929989 in words is "four hundred thirty-eight million, nine hundred twenty-nine thousand, nine hundred eighty-nine".