16671380 has 54 divisors (see below), whose sum is σ = 38951178. Its totient is φ = 5989280.

The previous prime is 16671377. The next prime is 16671427. The reversal of 16671380 is 8317661.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 3334276 = 3652^2 + 1826^2 .

It is a super-2 number, since 2×16671380² = 555869822208800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 17 ways as a sum of consecutive naturals, for example, 200819 + ... + 200901.

Almost surely, 2^16671380 is an apocalyptic number.

16671380 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 16671380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19475589).

16671380 is an abundant number, since it is smaller than the sum of its proper divisors (22279798).

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

16671380 is a wasteful number, since it uses less digits than its factorization.

16671380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 16671380 is about 4083.0601269146. The cubic root of 16671380 is about 255.4605543403.

The spelling of 16671380 in words is "sixteen million, six hundred seventy-one thousand, three hundred eighty".