18066738 has 32 divisors (see below), whose sum is σ = 37624320. Its totient is φ = 5777280.

The previous prime is 18066721. The next prime is 18066743. The reversal of 18066738 is 83766081.

It is a junction number, because it is equal to n+sod(n) for n = 18066696 and 18066705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25128 + ... + 25836.

It is an arithmetic number, because the mean of its divisors is an integer number (1175760).

Almost surely, 2^18066738 is an apocalyptic number.

18066738 is an abundant number, since it is smaller than the sum of its proper divisors (19557582).

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

18066738 is a wasteful number, since it uses less digits than its factorization.

18066738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 18066738 is about 4250.4985589928. The cubic root of 18066738 is about 262.3976344627.

The spelling of 18066738 in words is "eighteen million, sixty-six thousand, seven hundred thirty-eight".