18213946 has 8 divisors (see below), whose sum is σ = 27489024. Its totient is φ = 9050940.

The previous prime is 18213931. The next prime is 18213947. The reversal of 18213946 is 64931281.

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

It is not an unprimeable number, because it can be changed into a prime (18213947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27610 + ... + 28261.

It is an arithmetic number, because the mean of its divisors is an integer number (3436128).

Almost surely, 2^18213946 is an apocalyptic number.

18213946 is a deficient number, since it is larger than the sum of its proper divisors (9275078).

18213946 is a wasteful number, since it uses less digits than its factorization.

18213946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56036.

The product of its digits is 10368, while the sum is 34.

The square root of 18213946 is about 4267.7799849571. The cubic root of 18213946 is about 263.1083805889.

The spelling of 18213946 in words is "eighteen million, two hundred thirteen thousand, nine hundred forty-six".