16991324 has 12 divisors (see below), whose sum is σ = 33982704. Its totient is φ = 7281984.

The previous prime is 16991311. The next prime is 16991327. The reversal of 16991324 is 42319961.

16991324 is an admirable number.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16991327) 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, 303389 + ... + 303444.

It is an arithmetic number, because the mean of its divisors is an integer number (2831892).

Almost surely, 2^16991324 is an apocalyptic number.

16991324 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16991324 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16991324 is a wasteful number, since it uses less digits than its factorization.

16991324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606844 (or 606842 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 16991324 is about 4122.0533718039. The cubic root of 16991324 is about 257.0844095850.

The spelling of 16991324 in words is "sixteen million, nine hundred ninety-one thousand, three hundred twenty-four".