18828730 has 16 divisors (see below), whose sum is σ = 34041384. Its totient is φ = 7498240.

The previous prime is 18828721. The next prime is 18828737. The reversal of 18828730 is 3782881.

It can be written as a sum of positive squares in 4 ways, for example, as 10949481 + 7879249 = 3309^2 + 2807^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18828730.

It is not an unprimeable number, because it can be changed into a prime (18828737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1711 + ... + 6370.

Almost surely, 2^18828730 is an apocalyptic number.

18828730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18828730 is a deficient number, since it is larger than the sum of its proper divisors (15212654).

18828730 is a wasteful number, since it uses less digits than its factorization.

18828730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8321.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 18828730 is about 4339.2084531629. The cubic root of 18828730 is about 266.0359591087.

The spelling of 18828730 in words is "eighteen million, eight hundred twenty-eight thousand, seven hundred thirty".