18026730 has 24 divisors (see below), whose sum is σ = 46869732. Its totient is φ = 4807104.

The previous prime is 18026707. The next prime is 18026741. The reversal of 18026730 is 3762081.

It can be written as a sum of positive squares in 2 ways, for example, as 17867529 + 159201 = 4227^2 + 399^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18026694 and 18026703.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 100059 + ... + 100238.

Almost surely, 2^18026730 is an apocalyptic number.

18026730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18026730 is an abundant number, since it is smaller than the sum of its proper divisors (28843002).

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

18026730 is a wasteful number, since it uses less digits than its factorization.

18026730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200310 (or 200307 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 18026730 is about 4245.7896791999. The cubic root of 18026730 is about 262.2038019581.

The spelling of 18026730 in words is "eighteen million, twenty-six thousand, seven hundred thirty".