16444681 has 16 divisors (see below), whose sum is σ = 18595008. Its totient is φ = 14414400.

The previous prime is 16444679. The next prime is 16444691. The reversal of 16444681 is 18644461.

It is not a de Polignac number, because 16444681 - 2¹ = 16444679 is a prime.

It is a super-2 number, since 2×16444681² = 540855066383522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16444691) 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, 38851 + ... + 39271.

It is an arithmetic number, because the mean of its divisors is an integer number (1162188).

Almost surely, 2^16444681 is an apocalyptic number.

16444681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16444681 is a deficient number, since it is larger than the sum of its proper divisors (2150327).

16444681 is a wasteful number, since it uses less digits than its factorization.

16444681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its digits is 18432, while the sum is 34.

The square root of 16444681 is about 4055.2041872143. The cubic root of 16444681 is about 254.2973402173.

The spelling of 16444681 in words is "sixteen million, four hundred forty-four thousand, six hundred eighty-one".