18105040 has 20 divisors (see below), whose sum is σ = 42094404. Its totient is φ = 7241984.

The previous prime is 18105013. The next prime is 18105041. The reversal of 18105040 is 4050181.

It can be written as a sum of positive squares in 2 ways, for example, as 7529536 + 10575504 = 2744^2 + 3252^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 18104999 and 18105017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18105041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113077 + ... + 113236.

Almost surely, 2^18105040 is an apocalyptic number.

18105040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18105040 is an abundant number, since it is smaller than the sum of its proper divisors (23989364).

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

18105040 is a wasteful number, since it uses less digits than its factorization.

18105040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226326 (or 226320 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 18105040 is about 4255.0017626318. The cubic root of 18105040 is about 262.5829337349.

The spelling of 18105040 in words is "eighteen million, one hundred five thousand, forty".