16640343 has 16 divisors (see below), whose sum is σ = 25320160. Its totient is φ = 10793088.

The previous prime is 16640329. The next prime is 16640347. The reversal of 16640343 is 34304661.

16640343 is a `hidden beast` number, since 16 + 640 + 3 + 4 + 3 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-16640343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640347) 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, 7330 + ... + 9327.

It is an arithmetic number, because the mean of its divisors is an integer number (1582510).

Almost surely, 2^16640343 is an apocalyptic number.

16640343 is a deficient number, since it is larger than the sum of its proper divisors (8679817).

16640343 is a wasteful number, since it uses less digits than its factorization.

16640343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16703 (or 16697 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 16640343 is about 4079.2576530540. The cubic root of 16640343 is about 255.3019261082.

The spelling of 16640343 in words is "sixteen million, six hundred forty thousand, three hundred forty-three".