18260730 has 48 divisors (see below), whose sum is σ = 47856744. Its totient is φ = 4830720.

The previous prime is 18260717. The next prime is 18260743. The reversal of 18260730 is 3706281.

It is an interprime number because it is at equal distance from previous prime (18260717) and next prime (18260743).

It can be written as a sum of positive squares in 4 ways, for example, as 14722569 + 3538161 = 3837^2 + 1881^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18260694 and 18260703.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 11590 + ... + 13070.

Almost surely, 2^18260730 is an apocalyptic number.

18260730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18260730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23928372).

18260730 is an abundant number, since it is smaller than the sum of its proper divisors (29596014).

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

18260730 is a wasteful number, since it uses less digits than its factorization.

18260730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631 (or 1628 counting only the distinct ones).

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

The square root of 18260730 is about 4273.2575396295. The cubic root of 18260730 is about 263.3334597375. Note that the first 3 decimals are identical.

The spelling of 18260730 in words is "eighteen million, two hundred sixty thousand, seven hundred thirty".