16978093 has 4 divisors (see below), whose sum is σ = 18521568. Its totient is φ = 15434620.

The previous prime is 16978061. The next prime is 16978097. The reversal of 16978093 is 39087961.

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.

It is a cyclic number.

It is not a de Polignac number, because 16978093 - 2⁵ = 16978061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16978097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 771721 + ... + 771742.

It is an arithmetic number, because the mean of its divisors is an integer number (4630392).

Almost surely, 2^16978093 is an apocalyptic number.

It is an amenable number.

16978093 is a deficient number, since it is larger than the sum of its proper divisors (1543475).

16978093 is a wasteful number, since it uses less digits than its factorization.

16978093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543474.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 16978093 is about 4120.4481552375. The cubic root of 16978093 is about 257.0176624399.

The spelling of 16978093 in words is "sixteen million, nine hundred seventy-eight thousand, ninety-three".