16438881 has 16 divisors (see below), whose sum is σ = 23454144. Its totient is φ = 10205184.

The previous prime is 16438837. The next prime is 16438907. The reversal of 16438881 is 18883461.

It is not a de Polignac number, because 16438881 - 2⁶ = 16438817 is a prime.

It is a super-2 number, since 2×16438881² = 540473617064322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16438831) 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, 3286 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (1465884).

Almost surely, 2^16438881 is an apocalyptic number.

It is an amenable number.

16438881 is a deficient number, since it is larger than the sum of its proper divisors (7015263).

16438881 is a wasteful number, since it uses less digits than its factorization.

16438881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3440.

The product of its digits is 36864, while the sum is 39.

The square root of 16438881 is about 4054.4889936958. The cubic root of 16438881 is about 254.2674400121.

The spelling of 16438881 in words is "sixteen million, four hundred thirty-eight thousand, eight hundred eighty-one".