438845691 has 4 divisors (see below), whose sum is σ = 585127592. Its totient is φ = 292563792.

The previous prime is 438845689. The next prime is 438845699. The reversal of 438845691 is 196548834.

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

It is not a de Polignac number, because 438845691 - 2¹ = 438845689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 438845691.

It is not an unprimeable number, because it can be changed into a prime (438845699) 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, 73140946 + ... + 73140951.

It is an arithmetic number, because the mean of its divisors is an integer number (146281898).

Almost surely, 2^438845691 is an apocalyptic number.

438845691 is a deficient number, since it is larger than the sum of its proper divisors (146281901).

438845691 is a wasteful number, since it uses less digits than its factorization.

438845691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146281900.

The product of its digits is 829440, while the sum is 48.

The square root of 438845691 is about 20948.6441327357. The cubic root of 438845691 is about 759.9247911495.

The spelling of 438845691 in words is "four hundred thirty-eight million, eight hundred forty-five thousand, six hundred ninety-one".