16640380 has 48 divisors (see below), whose sum is σ = 36388800. Its totient is φ = 6386688.

The previous prime is 16640359. The next prime is 16640387. The reversal of 16640380 is 8304661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83521 + ... + 83719.

It is an arithmetic number, because the mean of its divisors is an integer number (758100).

Almost surely, 2^16640380 is an apocalyptic number.

16640380 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 16640380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18194400).

16640380 is an abundant number, since it is smaller than the sum of its proper divisors (19748420).

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

16640380 is a wasteful number, since it uses less digits than its factorization.

16640380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358 (or 356 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 16640380 is about 4079.2621881904. The cubic root of 16640380 is about 255.3021153303.

It can be divided in two parts, 16640 and 380, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 16640380 in words is "sixteen million, six hundred forty thousand, three hundred eighty".