16391232 has 168 divisors, whose sum is σ = 55473600. Its totient is φ = 4561920.

The previous prime is 16391227. The next prime is 16391237. The reversal of 16391232 is 23219361.

16391232 is a `hidden beast` number, since 1 + 639 + 1 + 23 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (16391227) and next prime (16391237).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 16391196 and 16391205.

It is not an unprimeable number, because it can be changed into a prime (16391237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82269 + ... + 82467.

It is an arithmetic number, because the mean of its divisors is an integer number (330200).

Almost surely, 2^16391232 is an apocalyptic number.

16391232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16391232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27736800).

16391232 is an abundant number, since it is smaller than the sum of its proper divisors (39082368).

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

16391232 is a wasteful number, since it uses less digits than its factorization.

16391232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241 (or 228 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 16391232 is about 4048.6086498944. The cubic root of 16391232 is about 254.0215328842.

The spelling of 16391232 in words is "sixteen million, three hundred ninety-one thousand, two hundred thirty-two".