16681382 has 4 divisors (see below), whose sum is σ = 25022076. Its totient is φ = 8340690.

The previous prime is 16681363. The next prime is 16681397. The reversal of 16681382 is 28318661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28318661 = 7 ⋅4045523.

It is a super-4 number, since 4×16681382⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4170344 + ... + 4170347.

It is an arithmetic number, because the mean of its divisors is an integer number (6255519).

Almost surely, 2^16681382 is an apocalyptic number.

16681382 is a deficient number, since it is larger than the sum of its proper divisors (8340694).

16681382 is an equidigital number, since it uses as much as digits as its factorization.

16681382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340693.

The product of its digits is 13824, while the sum is 35.

The square root of 16681382 is about 4084.2847599059. The cubic root of 16681382 is about 255.5116320086.

The spelling of 16681382 in words is "sixteen million, six hundred eighty-one thousand, three hundred eighty-two".