438820729 has 2 divisors, whose sum is σ = 438820730. Its totient is φ = 438820728.

The previous prime is 438820691. The next prime is 438820741. The reversal of 438820729 is 927028834.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438818704 + 2025 = 20948^2 + 45^2 .

It is a cyclic number.

It is not a de Polignac number, because 438820729 - 2¹³ = 438812537 is a prime.

It is not a weakly prime, because it can be changed into another prime (438800729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219410364 + 219410365.

It is an arithmetic number, because the mean of its divisors is an integer number (219410365).

Almost surely, 2^438820729 is an apocalyptic number.

It is an amenable number.

438820729 is a deficient number, since it is larger than the sum of its proper divisors (1).

438820729 is an equidigital number, since it uses as much as digits as its factorization.

438820729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 438820729 is about 20948.0483339141. The cubic root of 438820729 is about 759.9103824384.

The spelling of 438820729 in words is "four hundred thirty-eight million, eight hundred twenty thousand, seven hundred twenty-nine".