16981730 has 24 divisors (see below), whose sum is σ = 31318812. Its totient is φ = 6627296.

The previous prime is 16981703. The next prime is 16981787. The reversal of 16981730 is 3718961.

It can be written as a sum of positive squares in 2 ways, for example, as 16949689 + 32041 = 4117^2 + 179^2 .

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 94781 + ... + 94959.

Almost surely, 2^16981730 is an apocalyptic number.

16981730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16981730 is a deficient number, since it is larger than the sum of its proper divisors (14337082).

16981730 is an equidigital number, since it uses as much as digits as its factorization.

16981730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 16981730 is about 4120.8894670932. The cubic root of 16981730 is about 257.0360136665.

The spelling of 16981730 in words is "sixteen million, nine hundred eighty-one thousand, seven hundred thirty".