18006772 has 12 divisors (see below), whose sum is σ = 36013600. Its totient is φ = 7717176.

The previous prime is 18006763. The next prime is 18006839. The reversal of 18006772 is 27760081.

It is a happy number.

18006772 is an admirable number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 321522 + ... + 321577.

Almost surely, 2^18006772 is an apocalyptic number.

It is an amenable number.

18006772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18006772 is a wasteful number, since it uses less digits than its factorization.

18006772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643110 (or 643108 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 18006772 is about 4243.4386999225. The cubic root of 18006772 is about 262.1070013385.

The spelling of 18006772 in words is "eighteen million, six thousand, seven hundred seventy-two".