16978459 has 2 divisors, whose sum is σ = 16978460. Its totient is φ = 16978458.

The previous prime is 16978411. The next prime is 16978487. The reversal of 16978459 is 95487961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16978459 - 2⁷ = 16978331 is a prime.

It is not a weakly prime, because it can be changed into another prime (16978259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8489229 + 8489230.

It is an arithmetic number, because the mean of its divisors is an integer number (8489230).

Almost surely, 2^16978459 is an apocalyptic number.

16978459 is a deficient number, since it is larger than the sum of its proper divisors (1).

16978459 is an equidigital number, since it uses as much as digits as its factorization.

16978459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 16978459 is about 4120.4925676429. The cubic root of 16978459 is about 257.0195092862.

The spelling of 16978459 in words is "sixteen million, nine hundred seventy-eight thousand, four hundred fifty-nine".