18015772 has 12 divisors (see below), whose sum is σ = 31595256. Its totient is φ = 8988560.

The previous prime is 18015761. The next prime is 18015779. The reversal of 18015772 is 27751081.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18015779) 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 3 ways as a sum of consecutive naturals, for example, 2623 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (2632938).

Almost surely, 2^18015772 is an apocalyptic number.

It is an amenable number.

18015772 is a deficient number, since it is larger than the sum of its proper divisors (13579484).

18015772 is a wasteful number, since it uses less digits than its factorization.

18015772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9668 (or 9666 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 18015772 is about 4244.4990281540. The cubic root of 18015772 is about 262.1506621365.

The spelling of 18015772 in words is "eighteen million, fifteen thousand, seven hundred seventy-two".