16978793 has 8 divisors (see below), whose sum is σ = 18875136. Its totient is φ = 15166800.

The previous prime is 16978781. The next prime is 16978831. The reversal of 16978793 is 39787961.

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

It is a cyclic number.

It is not a de Polignac number, because 16978793 - 2⁴ = 16978777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16978193) 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, 20663 + ... + 21468.

It is an arithmetic number, because the mean of its divisors is an integer number (2359392).

Almost surely, 2^16978793 is an apocalyptic number.

16978793 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16978793 is a deficient number, since it is larger than the sum of its proper divisors (1896343).

16978793 is a wasteful number, since it uses less digits than its factorization.

16978793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42175.

The product of its digits is 571536, while the sum is 50.

The square root of 16978793 is about 4120.5330965786. The cubic root of 16978793 is about 257.0211946365.

It can be divided in two parts, 16978 and 793, that added together give a palindrome (17771).

The spelling of 16978793 in words is "sixteen million, nine hundred seventy-eight thousand, seven hundred ninety-three".