438909891 has 8 divisors (see below), whose sum is σ = 668815104. Its totient is φ = 250805640.

The previous prime is 438909881. The next prime is 438909929. The reversal of 438909891 is 198909834.

It is a happy number.

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

It is not a de Polignac number, because 438909891 - 2⁷ = 438909763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (438909881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10450215 + ... + 10450256.

It is an arithmetic number, because the mean of its divisors is an integer number (83601888).

Almost surely, 2^438909891 is an apocalyptic number.

438909891 is a deficient number, since it is larger than the sum of its proper divisors (229905213).

438909891 is a wasteful number, since it uses less digits than its factorization.

438909891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20900481.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 438909891 is about 20950.1763954388. The cubic root of 438909891 is about 759.9618465380.

The spelling of 438909891 in words is "four hundred thirty-eight million, nine hundred nine thousand, eight hundred ninety-one".