18384641 has 12 divisors (see below), whose sum is σ = 20379984. Its totient is φ = 16447200.

The previous prime is 18384629. The next prime is 18384677. The reversal of 18384641 is 14648381.

It is a de Polignac number, because none of the positive numbers 2^k-18384641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18384841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87026 + ... + 87236.

It is an arithmetic number, because the mean of its divisors is an integer number (1698332).

Almost surely, 2^18384641 is an apocalyptic number.

18384641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18384641 is a deficient number, since it is larger than the sum of its proper divisors (1995343).

18384641 is an equidigital number, since it uses as much as digits as its factorization.

18384641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400 (or 311 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 18384641 is about 4287.7314514787. The cubic root of 18384641 is about 263.9277474834.

The spelling of 18384641 in words is "eighteen million, three hundred eighty-four thousand, six hundred forty-one".