18180642 has 8 divisors (see below), whose sum is σ = 36361296. Its totient is φ = 6060212.

The previous prime is 18180641. The next prime is 18180647. The reversal of 18180642 is 24608181.

It is a sphenic number, since it is the product of 3 distinct primes.

18180642 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18180641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1515048 + ... + 1515059.

It is an arithmetic number, because the mean of its divisors is an integer number (4545162).

Almost surely, 2^18180642 is an apocalyptic number.

18180642 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.

18180642 is a wasteful number, since it uses less digits than its factorization.

18180642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3030112.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18180642 is about 4263.8764053382. The cubic root of 18180642 is about 262.9479191548.

The spelling of 18180642 in words is "eighteen million, one hundred eighty thousand, six hundred forty-two".