438739997 has 2 divisors, whose sum is σ = 438739998. Its totient is φ = 438739996.

The previous prime is 438739991. The next prime is 438740011. The reversal of 438739997 is 799937834.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356039161 + 82700836 = 18869^2 + 9094^2 .

It is a cyclic number.

It is not a de Polignac number, because 438739997 - 2⁴ = 438739981 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438739991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219369998 + 219369999.

It is an arithmetic number, because the mean of its divisors is an integer number (219369999).

Almost surely, 2^438739997 is an apocalyptic number.

It is an amenable number.

438739997 is a deficient number, since it is larger than the sum of its proper divisors (1).

438739997 is an equidigital number, since it uses as much as digits as its factorization.

438739997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 59.

The square root of 438739997 is about 20946.1212877229. The cubic root of 438739997 is about 759.8637781013.

The spelling of 438739997 in words is "four hundred thirty-eight million, seven hundred thirty-nine thousand, nine hundred ninety-seven".