16218923 has 16 divisors (see below), whose sum is σ = 19042560. Its totient is φ = 13527456.

The previous prime is 16218919. The next prime is 16218929. The reversal of 16218923 is 32981261.

It is a cyclic number.

It is not a de Polignac number, because 16218923 - 2² = 16218919 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16218923.

It is not an unprimeable number, because it can be changed into a prime (16218929) 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, 71336 + ... + 71562.

It is an arithmetic number, because the mean of its divisors is an integer number (1190160).

Almost surely, 2^16218923 is an apocalyptic number.

16218923 is a deficient number, since it is larger than the sum of its proper divisors (2823637).

16218923 is a wasteful number, since it uses less digits than its factorization.

16218923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466.

The product of its digits is 5184, while the sum is 32.

The square root of 16218923 is about 4027.2724020111. The cubic root of 16218923 is about 253.1282814796.

The spelling of 16218923 in words is "sixteen million, two hundred eighteen thousand, nine hundred twenty-three".