16691232 has 24 divisors (see below), whose sum is σ = 43814736. Its totient is φ = 5563712.

The previous prime is 16691221. The next prime is 16691239. The reversal of 16691232 is 23219661.

It is a tau number, because it is divible by the number of its divisors (24).

It is a self number, because there is not a number n which added to its sum of digits gives 16691232.

It is not an unprimeable number, because it can be changed into a prime (16691239) 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 in 3 ways as a sum of consecutive naturals, for example, 86838 + ... + 87029.

It is an arithmetic number, because the mean of its divisors is an integer number (1825614).

Almost surely, 2^16691232 is an apocalyptic number.

16691232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16691232 is an abundant number, since it is smaller than the sum of its proper divisors (27123504).

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

16691232 is a wasteful number, since it uses less digits than its factorization.

16691232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173880 (or 173872 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 16691232 is about 4085.4904234376. The cubic root of 16691232 is about 255.5619135014.

The spelling of 16691232 in words is "sixteen million, six hundred ninety-one thousand, two hundred thirty-two".