16421772 has 24 divisors (see below), whose sum is σ = 39639600. Its totient is φ = 5285056.

The previous prime is 16421731. The next prime is 16421773. The reversal of 16421772 is 27712461.

It is not an unprimeable number, because it can be changed into a prime (16421773) 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, 23247 + ... + 23942.

It is an arithmetic number, because the mean of its divisors is an integer number (1651650).

Almost surely, 2^16421772 is an apocalyptic number.

16421772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16421772 is an abundant number, since it is smaller than the sum of its proper divisors (23217828).

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

16421772 is a wasteful number, since it uses less digits than its factorization.

16421772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47225 (or 47223 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 16421772 is about 4052.3785607961. The cubic root of 16421772 is about 254.1791985699.

The spelling of 16421772 in words is "sixteen million, four hundred twenty-one thousand, seven hundred seventy-two".