18229772 has 12 divisors (see below), whose sum is σ = 34802376. Its totient is φ = 8286240.

The previous prime is 18229769. The next prime is 18229787. The reversal of 18229772 is 27792281.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 207113 + ... + 207200.

It is an arithmetic number, because the mean of its divisors is an integer number (2900198).

Almost surely, 2^18229772 is an apocalyptic number.

It is an amenable number.

18229772 is a deficient number, since it is larger than the sum of its proper divisors (16572604).

18229772 is a wasteful number, since it uses less digits than its factorization.

18229772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414328 (or 414326 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

The square root of 18229772 is about 4269.6337079426. The cubic root of 18229772 is about 263.1845630153.

The spelling of 18229772 in words is "eighteen million, two hundred twenty-nine thousand, seven hundred seventy-two".