16446381 has 32 divisors (see below), whose sum is σ = 26972160. Its totient is φ = 8703936.

The previous prime is 16446379. The next prime is 16446413. The reversal of 16446381 is 18364461.

16446381 = 104² + 105² + ... + 369².

It is not a de Polignac number, because 16446381 - 2¹ = 16446379 is a prime.

It is a super-2 number, since 2×16446381² = 540966895994322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16446301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18315 + ... + 19191.

It is an arithmetic number, because the mean of its divisors is an integer number (842880).

Almost surely, 2^16446381 is an apocalyptic number.

It is an amenable number.

16446381 is a deficient number, since it is larger than the sum of its proper divisors (10525779).

16446381 is a wasteful number, since it uses less digits than its factorization.

16446381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953.

The product of its digits is 13824, while the sum is 33.

The square root of 16446381 is about 4055.4137889986. The cubic root of 16446381 is about 254.3061027382.

The spelling of 16446381 in words is "sixteen million, four hundred forty-six thousand, three hundred eighty-one".