16993078 has 4 divisors (see below), whose sum is σ = 25489620. Its totient is φ = 8496538.

The previous prime is 16993073. The next prime is 16993099. The reversal of 16993078 is 87039961.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16993073) 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 as a sum of consecutive naturals, namely, 4248268 + ... + 4248271.

It is an arithmetic number, because the mean of its divisors is an integer number (6372405).

Almost surely, 2^16993078 is an apocalyptic number.

16993078 is a deficient number, since it is larger than the sum of its proper divisors (8496542).

16993078 is an equidigital number, since it uses as much as digits as its factorization.

16993078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496541.

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

The square root of 16993078 is about 4122.2661243544. The cubic root of 16993078 is about 257.0932554827.

The spelling of 16993078 in words is "sixteen million, nine hundred ninety-three thousand, seventy-eight".