16978481 has 8 divisors (see below), whose sum is σ = 18379200. Its totient is φ = 15591312.

The previous prime is 16978459. The next prime is 16978487. The reversal of 16978481 is 18487961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16978481 is a prime.

It is a super-2 number, since 2×16978481² = 576537634134722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16978487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695 + ... + 5868.

It is an arithmetic number, because the mean of its divisors is an integer number (2297400).

Almost surely, 2^16978481 is an apocalyptic number.

It is an amenable number.

16978481 is a deficient number, since it is larger than the sum of its proper divisors (1400719).

16978481 is a wasteful number, since it uses less digits than its factorization.

16978481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775.

The product of its digits is 96768, while the sum is 44.

The square root of 16978481 is about 4120.4952372257. The cubic root of 16978481 is about 257.0196202980.

The spelling of 16978481 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred eighty-one".