18406641 has 12 divisors (see below), whose sum is σ = 26976656. Its totient is φ = 11155320.

The previous prime is 18406639. The next prime is 18406667. The reversal of 18406641 is 14660481.

It is not a de Polignac number, because 18406641 - 2¹ = 18406639 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 18406599 and 18406608.

It is not an unprimeable number, because it can be changed into a prime (18406621) 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 11 ways as a sum of consecutive naturals, for example, 24991 + ... + 25716.

Almost surely, 2^18406641 is an apocalyptic number.

18406641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18406641 is a deficient number, since it is larger than the sum of its proper divisors (8570015).

18406641 is a wasteful number, since it uses less digits than its factorization.

18406641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50732 (or 50721 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 18406641 is about 4290.2961436246. The cubic root of 18406641 is about 264.0329819904.

The spelling of 18406641 in words is "eighteen million, four hundred six thousand, six hundred forty-one".