438798921 has 8 divisors (see below), whose sum is σ = 638253024. Its totient is φ = 265938720.

The previous prime is 438798911. The next prime is 438798923. The reversal of 438798921 is 129897834.

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

It is not a de Polignac number, because 438798921 - 2⁵ = 438798889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (438798923) 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, 6648436 + ... + 6648501.

It is an arithmetic number, because the mean of its divisors is an integer number (79781628).

Almost surely, 2^438798921 is an apocalyptic number.

It is an amenable number.

438798921 is a deficient number, since it is larger than the sum of its proper divisors (199454103).

438798921 is a wasteful number, since it uses less digits than its factorization.

438798921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13296951.

The product of its digits is 870912, while the sum is 51.

The square root of 438798921 is about 20947.5278016285. The cubic root of 438798921 is about 759.8977938504.

The spelling of 438798921 in words is "four hundred thirty-eight million, seven hundred ninety-eight thousand, nine hundred twenty-one".