438443857 has 4 divisors (see below), whose sum is σ = 438710116. Its totient is φ = 438177600.

The previous prime is 438443849. The next prime is 438443861. The reversal of 438443857 is 758344834.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180391761 + 258052096 = 13431^2 + 16064^2 .

It is a cyclic number.

It is not a de Polignac number, because 438443857 - 2³ = 438443849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (438443807) 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 in 3 ways as a sum of consecutive naturals, for example, 130644 + ... + 133957.

It is an arithmetic number, because the mean of its divisors is an integer number (109677529).

Almost surely, 2^438443857 is an apocalyptic number.

It is an amenable number.

438443857 is a deficient number, since it is larger than the sum of its proper divisors (266259).

438443857 is a wasteful number, since it uses less digits than its factorization.

438443857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266258.

The product of its digits is 1290240, while the sum is 46.

The square root of 438443857 is about 20939.0510052390. The cubic root of 438443857 is about 759.6927757544.

The spelling of 438443857 in words is "four hundred thirty-eight million, four hundred forty-three thousand, eight hundred fifty-seven".