438081111 has 24 divisors (see below), whose sum is σ = 682181136. Its totient is φ = 269303040.

The previous prime is 438081107. The next prime is 438081113. The reversal of 438081111 is 111180834.

It is not a de Polignac number, because 438081111 - 2² = 438081107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (438081113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180496 + ... + 182906.

It is an arithmetic number, because the mean of its divisors is an integer number (28424214).

Almost surely, 2^438081111 is an apocalyptic number.

438081111 is a deficient number, since it is larger than the sum of its proper divisors (244100025).

438081111 is a wasteful number, since it uses less digits than its factorization.

438081111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983 (or 3980 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 438081111 is about 20930.3872634980. The cubic root of 438081111 is about 759.4832076457.

It can be divided in two parts, 4380 and 81111, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 438081111 in words is "four hundred thirty-eight million, eighty-one thousand, one hundred eleven".