16332381 has 64 divisors (see below), whose sum is σ = 28672000. Its totient is φ = 9097920.

The previous prime is 16332353. The next prime is 16332383. The reversal of 16332381 is 18323361.

It is a happy number.

16332381 is a `hidden beast` number, since 1 + 633 + 23 + 8 + 1 = 666.

It is not a de Polignac number, because 16332381 - 2⁹ = 16331869 is a prime.

It is a super-2 number, since 2×16332381² = 533493338258322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16332383) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 206700 + ... + 206778.

It is an arithmetic number, because the mean of its divisors is an integer number (448000).

Almost surely, 2^16332381 is an apocalyptic number.

It is an amenable number.

16332381 is a deficient number, since it is larger than the sum of its proper divisors (12339619).

16332381 is a wasteful number, since it uses less digits than its factorization.

16332381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 145 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 16332381 is about 4041.3340619157. The cubic root of 16332381 is about 253.7171557545.

The spelling of 16332381 in words is "sixteen million, three hundred thirty-two thousand, three hundred eighty-one".