18870730 has 16 divisors (see below), whose sum is σ = 34398720. Its totient is φ = 7452432.

The previous prime is 18870727. The next prime is 18870749. The reversal of 18870730 is 3707881.

It is a happy number.

It is a super-2 number, since 2×18870730² = 712208901465800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11154 + ... + 12733.

It is an arithmetic number, because the mean of its divisors is an integer number (2149920).

Almost surely, 2^18870730 is an apocalyptic number.

18870730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18870730 is a deficient number, since it is larger than the sum of its proper divisors (15527990).

18870730 is a wasteful number, since it uses less digits than its factorization.

18870730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23973.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 18870730 is about 4344.0453496712. The cubic root of 18870730 is about 266.2336218040.

It can be divided in two parts, 18870 and 730, that added together give a square (19600 = 140²).

The spelling of 18870730 in words is "eighteen million, eight hundred seventy thousand, seven hundred thirty".