16800381 has 12 divisors (see below), whose sum is σ = 26134108. Its totient is φ = 10338624.

The previous prime is 16800359. The next prime is 16800383. The reversal of 16800381 is 18300861.

It can be written as a sum of positive squares in 2 ways, for example, as 1071225 + 15729156 = 1035^2 + 3966^2 .

It is not a de Polignac number, because 16800381 - 2⁵ = 16800349 is a prime.

It is a super-2 number, since 2×16800381² = 564505603490322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16800383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71680 + ... + 71913.

Almost surely, 2^16800381 is an apocalyptic number.

It is an amenable number.

16800381 is a deficient number, since it is larger than the sum of its proper divisors (9333727).

16800381 is a wasteful number, since it uses less digits than its factorization.

16800381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143612 (or 143609 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 16800381 is about 4098.8267833613. The cubic root of 16800381 is about 256.1177690966.

The spelling of 16800381 in words is "sixteen million, eight hundred thousand, three hundred eighty-one".