16809972 has 24 divisors (see below), whose sum is σ = 39386592. Its totient is φ = 5580000.

The previous prime is 16809971. The next prime is 16809977. The reversal of 16809972 is 27990861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16809971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222 + ... + 5802.

It is an arithmetic number, because the mean of its divisors is an integer number (1641108).

Almost surely, 2^16809972 is an apocalyptic number.

16809972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16809972 is an abundant number, since it is smaller than the sum of its proper divisors (22576620).

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

16809972 is a wasteful number, since it uses less digits than its factorization.

16809972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5839 (or 5837 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 16809972 is about 4099.9965853644. The cubic root of 16809972 is about 256.1664973215.

The spelling of 16809972 in words is "sixteen million, eight hundred nine thousand, nine hundred seventy-two".