16618939 has 4 divisors (see below), whose sum is σ = 17493640. Its totient is φ = 15744240.

The previous prime is 16618933. The next prime is 16618951. The reversal of 16618939 is 93981661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16618939 - 2¹³ = 16610747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16618895 and 16618904.

It is not an unprimeable number, because it can be changed into a prime (16618933) 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 3 ways as a sum of consecutive naturals, for example, 437322 + ... + 437359.

It is an arithmetic number, because the mean of its divisors is an integer number (4373410).

Almost surely, 2^16618939 is an apocalyptic number.

16618939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

16618939 is a deficient number, since it is larger than the sum of its proper divisors (874701).

16618939 is an equidigital number, since it uses as much as digits as its factorization.

16618939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874700.

The product of its digits is 69984, while the sum is 43.

The square root of 16618939 is about 4076.6332923136. The cubic root of 16618939 is about 255.1924166059.

The spelling of 16618939 in words is "sixteen million, six hundred eighteen thousand, nine hundred thirty-nine".