16981078 has 4 divisors (see below), whose sum is σ = 25471620. Its totient is φ = 8490538.

The previous prime is 16981073. The next prime is 16981103. The reversal of 16981078 is 87018961.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 16981078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16981073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4245268 + ... + 4245271.

It is an arithmetic number, because the mean of its divisors is an integer number (6367905).

Almost surely, 2^16981078 is an apocalyptic number.

16981078 is a deficient number, since it is larger than the sum of its proper divisors (8490542).

16981078 is an equidigital number, since it uses as much as digits as its factorization.

16981078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8490541.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 16981078 is about 4120.8103571992. The cubic root of 16981078 is about 257.0327240601.

The spelling of 16981078 in words is "sixteen million, nine hundred eighty-one thousand, seventy-eight".