18066402 has 20 divisors (see below), whose sum is σ = 40482486. Its totient is φ = 6022080.

The previous prime is 18066383. The next prime is 18066403. The reversal of 18066402 is 20466081.

18066402 is a `hidden beast` number, since 18 + 0 + 6 + 640 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15752961 + 2313441 = 3969^2 + 1521^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18066403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55599 + ... + 55922.

Almost surely, 2^18066402 is an apocalyptic number.

18066402 is an abundant number, since it is smaller than the sum of its proper divisors (22416084).

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

18066402 is a wasteful number, since it uses less digits than its factorization.

18066402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111535 (or 111526 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 18066402 is about 4250.4590340339. The cubic root of 18066402 is about 262.3960077874.

The spelling of 18066402 in words is "eighteen million, sixty-six thousand, four hundred two".