18012646 has 8 divisors (see below), whose sum is σ = 28441080. Its totient is φ = 8532288.

The previous prime is 18012613. The next prime is 18012647. The reversal of 18012646 is 64621081.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012647) 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 3 ways as a sum of consecutive naturals, for example, 236971 + ... + 237046.

It is an arithmetic number, because the mean of its divisors is an integer number (3555135).

Almost surely, 2^18012646 is an apocalyptic number.

18012646 is a deficient number, since it is larger than the sum of its proper divisors (10428434).

18012646 is a wasteful number, since it uses less digits than its factorization.

18012646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474038.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 18012646 is about 4244.1307708411. The cubic root of 18012646 is about 262.1354989345.

The spelling of 18012646 in words is "eighteen million, twelve thousand, six hundred forty-six".