16623943 has 8 divisors (see below), whose sum is σ = 20116512. Its totient is φ = 13410816.

The previous prime is 16623913. The next prime is 16623949. The reversal of 16623943 is 34932661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16623943 - 2¹⁷ = 16492871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16623899 and 16623908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69730 + ... + 69967.

It is an arithmetic number, because the mean of its divisors is an integer number (2514564).

Almost surely, 2^16623943 is an apocalyptic number.

16623943 is a deficient number, since it is larger than the sum of its proper divisors (3492569).

16623943 is a wasteful number, since it uses less digits than its factorization.

16623943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139721.

The product of its digits is 23328, while the sum is 34.

The square root of 16623943 is about 4077.2469878584. The cubic root of 16623943 is about 255.2180270396.

The spelling of 16623943 in words is "sixteen million, six hundred twenty-three thousand, nine hundred forty-three".