18012641 has 8 divisors (see below), whose sum is σ = 18440160. Its totient is φ = 17589312.

The previous prime is 18012613. The next prime is 18012647. The reversal of 18012641 is 14621081.

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

It is a cyclic number.

It is not a de Polignac number, because 18012641 - 2¹⁴ = 17996257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18012647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8681 + ... + 10553.

It is an arithmetic number, because the mean of its divisors is an integer number (2305020).

Almost surely, 2^18012641 is an apocalyptic number.

It is an amenable number.

18012641 is a deficient number, since it is larger than the sum of its proper divisors (427519).

18012641 is a wasteful number, since it uses less digits than its factorization.

18012641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095.

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 18012641 is about 4244.1301817923. The cubic root of 18012641 is about 262.1354746797.

It can be divided in two parts, 180 and 12641, that added together give a palindrome (12821).

The spelling of 18012641 in words is "eighteen million, twelve thousand, six hundred forty-one".