438494993 has 8 divisors (see below), whose sum is σ = 453890280. Its totient is φ = 423118080.

The previous prime is 438494981. The next prime is 438495097. The reversal of 438494993 is 399494834.

It can be written as a sum of positive squares in 4 ways, for example, as 59336209 + 379158784 = 7703^2 + 19472^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 438494993 - 2⁸ = 438494737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (438494933) 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 7 ways as a sum of consecutive naturals, for example, 59171 + ... + 66167.

It is an arithmetic number, because the mean of its divisors is an integer number (56736285).

Almost surely, 2^438494993 is an apocalyptic number.

It is an amenable number.

438494993 is a deficient number, since it is larger than the sum of its proper divisors (15395287).

438494993 is a wasteful number, since it uses less digits than its factorization.

438494993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9187.

The product of its digits is 3359232, while the sum is 53.

The square root of 438494993 is about 20940.2720373924. The cubic root of 438494993 is about 759.7223090983.

The spelling of 438494993 in words is "four hundred thirty-eight million, four hundred ninety-four thousand, nine hundred ninety-three".