18169641 has 18 divisors (see below), whose sum is σ = 30530682. Its totient is φ = 10382400.

The previous prime is 18169637. The next prime is 18169691. The reversal of 18169641 is 14696181.

It is a happy number.

18169641 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 9 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 705600 = 4179^2 + 840^2 .

It is not a de Polignac number, because 18169641 - 2² = 18169637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18169596 and 18169605.

It is not an unprimeable number, because it can be changed into a prime (18169621) 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 17 ways as a sum of consecutive naturals, for example, 20160 + ... + 21041.

It is an arithmetic number, because the mean of its divisors is an integer number (1696149).

Almost surely, 2^18169641 is an apocalyptic number.

It is an amenable number.

18169641 is a deficient number, since it is larger than the sum of its proper divisors (12361041).

18169641 is a wasteful number, since it uses less digits than its factorization.

18169641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41221 (or 41211 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 18169641 is about 4262.5861868119. The cubic root of 18169641 is about 262.8948723719.

The spelling of 18169641 in words is "eighteen million, one hundred sixty-nine thousand, six hundred forty-one".