16323840 has 216 divisors, whose sum is σ = 61381320. Its totient is φ = 3981312.

The previous prime is 16323833. The next prime is 16323851. The reversal of 16323840 is 4832361.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 831744 + 15492096 = 912^2 + 3936^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 149706 + ... + 149814.

Almost surely, 2^16323840 is an apocalyptic number.

16323840 is a gapful number since it is divisible by the number (10) 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 16323840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30690660).

16323840 is an abundant number, since it is smaller than the sum of its proper divisors (45057480).

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

16323840 is a wasteful number, since it uses less digits than its factorization.

16323840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 16323840 is about 4040.2772182116. The cubic root of 16323840 is about 253.6729210104.

The spelling of 16323840 in words is "sixteen million, three hundred twenty-three thousand, eight hundred forty".