18169040 has 20 divisors (see below), whose sum is σ = 42243204. Its totient is φ = 7267584.

The previous prime is 18169031. The next prime is 18169049. The reversal of 18169040 is 4096181.

It is an interprime number because it is at equal distance from previous prime (18169031) and next prime (18169049).

It can be written as a sum of positive squares in 2 ways, for example, as 9193024 + 8976016 = 3032^2 + 2996^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×18169040² = 660228029043200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18168994 and 18169012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18169049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113477 + ... + 113636.

Almost surely, 2^18169040 is an apocalyptic number.

18169040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18169040 is an abundant number, since it is smaller than the sum of its proper divisors (24074164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18169040 is a wasteful number, since it uses less digits than its factorization.

18169040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227126 (or 227120 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18169040 is about 4262.5156891207. The cubic root of 18169040 is about 262.8919737353.

The spelling of 18169040 in words is "eighteen million, one hundred sixty-nine thousand, forty".