16764381 has 16 divisors (see below), whose sum is σ = 25036800. Its totient is φ = 11085984.

The previous prime is 16764379. The next prime is 16764389. The reversal of 16764381 is 18346761.

16764381 is a `hidden beast` number, since 1 + 6 + 7 + 643 + 8 + 1 = 666.

It is not a de Polignac number, because 16764381 - 2¹ = 16764379 is a prime.

It is a super-2 number, since 2×16764381² = 562088940626322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16764389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985 + ... + 5873.

It is an arithmetic number, because the mean of its divisors is an integer number (1564800).

Almost surely, 2^16764381 is an apocalyptic number.

It is an amenable number.

16764381 is a deficient number, since it is larger than the sum of its proper divisors (8272419).

16764381 is a wasteful number, since it uses less digits than its factorization.

16764381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5025 (or 5019 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 16764381 is about 4094.4329277691. The cubic root of 16764381 is about 255.9347011595.

The spelling of 16764381 in words is "sixteen million, seven hundred sixty-four thousand, three hundred eighty-one".