438318993 has 16 divisors (see below), whose sum is σ = 669301760. Its totient is φ = 249947856.

The previous prime is 438318989. The next prime is 438319001. The reversal of 438318993 is 399813834.

It is not a de Polignac number, because 438318993 - 2² = 438318989 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 (438338993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11203 + ... + 31656.

It is an arithmetic number, because the mean of its divisors is an integer number (41831360).

Almost surely, 2^438318993 is an apocalyptic number.

It is an amenable number.

438318993 is a deficient number, since it is larger than the sum of its proper divisors (230982767).

438318993 is a wasteful number, since it uses less digits than its factorization.

438318993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43356.

The product of its digits is 559872, while the sum is 48.

The square root of 438318993 is about 20936.0691869319. The cubic root of 438318993 is about 759.6206515181.

The spelling of 438318993 in words is "four hundred thirty-eight million, three hundred eighteen thousand, nine hundred ninety-three".