18216946 has 8 divisors (see below), whose sum is σ = 29809584. Its totient is φ = 8280420.

The previous prime is 18216941. The next prime is 18216971. The reversal of 18216946 is 64961281.

It is a happy number.

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 (18216941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414000 + ... + 414043.

It is an arithmetic number, because the mean of its divisors is an integer number (3726198).

Almost surely, 2^18216946 is an apocalyptic number.

18216946 is a deficient number, since it is larger than the sum of its proper divisors (11592638).

18216946 is a wasteful number, since it uses less digits than its factorization.

18216946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828056.

The product of its digits is 20736, while the sum is 37.

The square root of 18216946 is about 4268.1314412750. The cubic root of 18216946 is about 263.1228252313.

The spelling of 18216946 in words is "eighteen million, two hundred sixteen thousand, nine hundred forty-six".