18860730 has 128 divisors (see below), whose sum is σ = 56678400. Its totient is φ = 3919104.

The previous prime is 18860689. The next prime is 18860731. The reversal of 18860730 is 3706881.

18860730 is nontrivially palindromic in base 12.

It is a super-2 number, since 2×18860730² = 711454272265800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18860691 and 18860700.

It is not an unprimeable number, because it can be changed into a prime (18860731) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 115629 + ... + 115791.

It is an arithmetic number, because the mean of its divisors is an integer number (442800).

Almost surely, 2^18860730 is an apocalyptic number.

18860730 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 18860730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28339200).

18860730 is an abundant number, since it is smaller than the sum of its proper divisors (37817670).

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

18860730 is a wasteful number, since it uses less digits than its factorization.

18860730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18860730 is about 4342.8941962705. The cubic root of 18860730 is about 266.1865858806.

The spelling of 18860730 in words is "eighteen million, eight hundred sixty thousand, seven hundred thirty".