16979381 has 4 divisors (see below), whose sum is σ = 17060064. Its totient is φ = 16898700.

The previous prime is 16979363. The next prime is 16979383. The reversal of 16979381 is 18397961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18397961 = 17 ⋅1082233.

It is a cyclic number.

It is not a de Polignac number, because 16979381 - 2¹⁴ = 16962997 is a prime.

It is a super-2 number, since 2×16979381² = 576598758286322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16979383) 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 3 ways as a sum of consecutive naturals, for example, 40025 + ... + 40446.

It is an arithmetic number, because the mean of its divisors is an integer number (4265016).

Almost surely, 2^16979381 is an apocalyptic number.

It is an amenable number.

16979381 is a deficient number, since it is larger than the sum of its proper divisors (80683).

16979381 is an equidigital number, since it uses as much as digits as its factorization.

16979381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80682.

The product of its digits is 81648, while the sum is 44.

The square root of 16979381 is about 4120.6044459521. The cubic root of 16979381 is about 257.0241616067.

The spelling of 16979381 in words is "sixteen million, nine hundred seventy-nine thousand, three hundred eighty-one".