18229916 has 24 divisors (see below), whose sum is σ = 33956496. Its totient is φ = 8533760.

The previous prime is 18229901. The next prime is 18229919. The reversal of 18229916 is 61992281.

It is a self number, because there is not a number n which added to its sum of digits gives 18229916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18229919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14846 + ... + 16026.

It is an arithmetic number, because the mean of its divisors is an integer number (1414854).

Almost surely, 2^18229916 is an apocalyptic number.

It is an amenable number.

18229916 is a deficient number, since it is larger than the sum of its proper divisors (15726580).

18229916 is a wasteful number, since it uses less digits than its factorization.

18229916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1427 counting only the distinct ones).

The product of its digits is 15552, while the sum is 38.

The square root of 18229916 is about 4269.6505711826. The cubic root of 18229916 is about 263.1852559930.

The spelling of 18229916 in words is "eighteen million, two hundred twenty-nine thousand, nine hundred sixteen".